8.26% ❧ United States. Bureau of Fisheries. Fishery circular. [Washington] : The Bureau. (1960)

8.17% ❧ Conklin, Edwin Grant, 1863-1952. A synopsis of the general morphology of animals. Princeton, Princeton university press. (1927)

7.49% ❧ James Orton, Edward Asahel Birge. Comparative Zoology: Structural and Systematic, for Use in Schools and Colleges. Harper & brothers. (1883)

7.31% ❧ Castle, William E. (William Ernest), 1867-1962. Heredity of hair-length in guinea-pigs and its bearing on the theory of pure gametes. Washington, D.C. : Carnegie Institution of Washington. (1906)

7.2% ❧ David Starr Jordan , Vernon Lyman Kellogg , Harold Heath. Animals: A Text-book of Zoology. D. Appleton and Company. (1905)

7.12% ❧ M. Harbison. Elements of zoology. (1874)

7.11% ❧ Hubbard Winslow Mitchell. The Evolution of Life. G. P. Putnam's sons. (1891)

6.91% ❧ Jordan, David Starr, 1851-1931. Animal studies; a text-book of elementary zoology for use in high schools and colleges. New York, D. Appleton and company. (1903)

6.88% ❧ Aristotle. The works of Aristotle. Oxford : Clarendon Press. (1908)

6.85% ❧ Agassiz, Louis, 1807-1873. The structure of animal life. Six lectures delivered at the Brooklyn academy of music in January and February, 1862. New York, C. Scribner and company. (1866)

6.73% ❧ William Smellie. The Philosophy of Natural History. Thompson, Bigelow & Brown. (1873)

6.52% ❧ Clark, Austin Hobart, b. 1880. The new evolution; zoogenesis. Baltimore, The William & Wilkins Company. (1930)

6.5% ❧ Bostock, Frank C. (Frank Charles), 1866-1912. The training of wild animals. New York : Century Co.. (1903)

6.47% ❧ Dalyell, John Graham, Sir, 1775-1851. Observations on some interesting phenomena in animal physiology, exhibited by several species of Planariae. Illustrated by coloured figures of living animals. Edinburgh, Archibald Constable. (1814)

6.39% ❧ Henry Alleyne Nicholson. Outlines of natural history for beginners. (1873)

6.37% ❧ Charles Letourneau. Biology. J.B. Lippincott and co.. (1878)

6.36% ❧ Letourneau, Charles Jean Marie, 1831-1902. Biology. London, Chapman and Hall ; Philadelphia, J.B. Lippincott and co.. (1878)

6.33% ❧ Berg, Carlos, 1843-1902. Tratado elemental de zoología. Montevideo Dornaleche y Reyes, Editores. (1893)

6.31% ❧ Richard Owen. On the Classification and Geographical Distribution of the Mammalia: To which is Added an .... J.W. Parker. (1859)

6.28% ❧ Robert Mudie. First lines of zoology: By Question and Answer .... Whittaker, Treacher, and co.. (1831)

6.28% ❧ Henry Alleyne Nicholson. An introductory text-book of zoology. (1871)

5.92% ❧ John Wesley, Robert Mudie. A Compendium of Natural Philosophy: Being a Survey of the Wisdom of God in the Creation. Printed for Thomas Tegg and Son. (1836)

5.87% ❧ John Wesley, Charles Bonnet, Louis Dutens , Robert Mudie. A Compendium of Natural Philosophy: Being a Survey of the Wisdom of God in the Creation. Printed for Thomas Tegg and Son. (1836)

5.87% ❧ Ernst Heinrich Philipp August Haeckel , Edwin Ray Lankester. The History of Creation, Or, The Development of the Earth and Its Inhabitants by the Action of .... D. Appleton and Company. (1880)

5.78% ❧ Lankester, E. Ray (Edwin Ray), Sir, 1847-1929. Extinct animals. London, A. Constable & co., ltd.. (1905)

5.75% ❧ John Cleland. The Evolutions of Organization: Address to the Medical Students at the Opening of the Winter .... J. Maclehose. (1880)

5.56% ❧ Roget, Peter Mark, 1779-1869. Animal and vegetable physiology, considered with reference to natural theology. London, W. Pickering. (1834)

5.52% ❧ Calkins, Gary N. (Gary Nathan), b. 1869. Biology. New York, H. Holt and company. (1914)

5.45% ❧ Henry Alleyne Nicholson. Advanced Text-book of Zoology for Junior Students. Blackwood. (1878)

5.39% ❧ Goldsmith, Oliver, 1730?-1774. A history of the earth, and animated nature. London, Wingrave and Collingwood [etc.]. (1816)

5.38% ❧ Lewes, George Henry, 1817-1878. Studies in animal life. New York, Harper. (1860)

5.36% ❧ Aaron Franklin Shull , George Roger Larue , Alexander Grant Ruthven. Principles of Animal Biology. McGraw-Hill book company , inc.. (1920)

5.33% ❧ Beneden (Pierre Joseph). Animal parasites and messmates. D. Appleton and Co.. (1876)

5.31% ❧ Robert Mackenzie Beverley. The Darwinian Theory of the Transmutation of Species. J. Nisbet. (1867)

5.28% ❧ Galloway, Thomas Walton, 1866-1929. Zoology : a textbook for universities, colleges and normal schools / Thomas Walton Galloway. Philadelphia : Blakiston. (1915)

5.25% ❧ Sydney John Hickson. The Story of Life in the Seas. D. Appleton and company. (1898)

5.23% ❧ Ernst Heinrich Philipp August Haeckel. The Evolution of Man: A Popular Scientific Study. Putnam. (1910)

5.19% ❧ John Hunter, Richard Owen. Essays and Observations on Natural History, Anatomy, Physiology, Psychology .... J. Van Voorst. (1861)

5.18% ❧ Vernon Lyman Kellogg. Elementary Zoology. H. Holt and company. (1901)

5.18% ❧ Karl Semper. The Natural Conditions of Existence as They Affect Animal Life. Kegan Paul, Trench & Co.. (1883)

5.18% ❧ Parker, George Howard, 1864-1955. What evolution is. Cambridge, Harvard University Press. (1925)

5.17% ❧ Jones, F. Wood (Frederic Wood), 1879-1954. Arboreal man. London : E. Arnold. (1916)

5.09% ❧ Kidd, John, 1775-1851. On the adaptation of external nature to the physical condition of man, principally with reference to the supply of his wants and the exercise of his intellectual faculties. London, Pickering. (1833)

5.09% ❧ Agassiz, Louis, 1807-1873. Outlines of comparative physiology touching the structure and development of the races of animals, living and extinct : for the use of schools and colleges. London : Bell & Daldy. (1870)

5.07% ❧ Galloway, Thomas Walton, 1866-. Zoology; a text-book for secondary schools, normal schools and colleges. Philadelphia, P. Blakiston. (1909)

5.07% ❧ Galloway, Thomas Walton, 1866-. Zoology; a text-book for secondary schools, normal schools and colleges. Philadelphia, P. Blakiston. (1909)

5.07% ❧ Skrimshire, Fenwick. A series of essays introductory to the study of natural history. London : J. Johnson. (1805)

5.07% ❧ Henry James Clark. Mind in Nature: Or The Origin of Life, and the Mode of Development of Animals. Appleton. (1865)

5.05% ❧ Samuel Butler. Evolution, Old and New: Or, The Theories of Buffon. S. E. Cassino. (1879)

5.03% ❧ Salt, Henry Stephens, 1851-1939. Animals' rights considered in relation to social progress : with a bibliographical appendix. London ; New York : G. Bell. (1892)

5% ❧ Buchanan, James William, 1888-. Elements of biology, with special reference to their rôle in the lives of animals. New York, London, Harper & brothers. (1933)

4.98% ❧ Goldsmith, Oliver, 1730?-1774. A history of the earth, and animated nature. London, Wingrave and Collingwood [etc.]. (1816)

4.97% ❧ Metchnikoff, Elie, 1845-1916. Immunity in infective diseases. Cambridge : University Press. (1907)

4.94% ❧ Kidd, John, 1775-1851. On the adaptation of external nature to the physical condition of man : principally with reference to the supply of his wants, and the exercise of his intellectual faculties. London : W. Pickering. (1837)

4.94% ❧ Coleman, Walter Moore, 1863-1926. Beginners' zoology. Toronto : Macmillan. (1921)

4.94% ❧ Huish, Robert, 1777-1850. The wonders of the animal kingdom : exhibiting delineations of the most distinguished wild animals, in the various menageris of this country : accompanied by a concise description of the natural history of each animal, in its savage or domesticated state : including curious and interesting anecdotes and facts, characteristic of its peculiar habits : collected from original information. London : Printed for T. Kelly. (1830)

4.92% ❧ Elliott, Alfred Marlyn, 1905-. Zoology. New York, Appleton-Century-Crofts. (1952)

4.92% ❧ Lones, Thomas East. Aristotle's researches in natural science. London, West, Newman & co.. (1912)

4.91% ❧ Keen, William W. (William Williams), b. 1837. I believe in God and in evolution. Philadelphia, London, J.B. Lippincott company. (1922)

4.86% ❧ Butler, Samuel, 1835-1902. Evolution, old and new, or, The theories of Buffon, Dr. Erasmus Darwin and Lamarck, as compared with that of Charles Darwin. London : Fifield. (1911)

4.84% ❧ Montgomery Albert Ward. Outlines of Zoology and Comparative Anatomy.. Fannin. (1874)

4.83% ❧ United States Bureau of Education, Robert Wilson Shufeldt. Outlines for a museum of anatomy. G.P.O.. (1885)

4.76% ❧ Shaw, Thomas, 1843-1918. Animal breeding. New York, Orange Judd Co.. (1901)

4.71% ❧ Littauer, Vladimir S. Moderno tratado de equitación : guía illustrada para llegar a ser un excelente jinete. Barcelona : Mateu. (1900)

4.7% ❧ [Mayne, Bruce], 1882- [from old catalog]. Experimental insect transmission of anthrax. Washington, Govt. print. off.. (1914)

4.68% ❧ Charles Manning Child. Senescence and Rejuvenescence. The University ofChicago press. (1915)

4.68% ❧ Thomas Southwood Smith, Southwood Smith. The philosophy of health; or, An exposition of the physical and mental constitution of man, with .... (1847)

4.65% ❧ Goldsmith, Oliver, 1730?-1774. A history of the earth and animated nature. London : Printed for Richardson & co.. (1822)

4.63% ❧ Edward M. Cooper. Collected papers. (1885)

4.61% ❧ Child, Charles Manning, 1869-1954. Senescence and rejuvenescence. Chicago, Ill., The University of Chicago press. (1915)

4.61% ❧ Browne, Peter Arrell, 1782-1860. [from old catalog]. An essay on the veterinary art;. Philadelphia, Printed by J. Thompson. (1837)

4.6% ❧ Anton Pannekoek , Nathan Weiser. Marxism and Darwinism. C. H. Kerr & company, co-operative. (1913)

4.58% ❧ Lardé-Arthés, Charles Robert. Local immunity. (1923)

4.55% ❧ Beddard, Frank E. (Frank Evers), 1858-1925. Natural history in zoological gardens; being some account of vertebrated animals, with special reference to those usually to be seen in the Zoological society's gardens in London and similar institutions. London, A. Constable & co., ltd.; Philadelphia, J. B. Lippincott company. (1905)

4.54% ❧ U.S. Fish and Wildlife Service. Special scientific report. Seattle, National Marine Fisheries Service; for sale by the Supt. of Docs., U.S. Govt. Print. Off.. (1949)

4.54% ❧ John Hunter, Richard Owen. Essays and Observations on Natural History, Anatomy, Physiology, Psychology, and Geology. J. Van Voorst. (1861)

4.5% ❧ Samuel Jackson Holmes. The Elements of Animal Biology. P. Blakiston's son & co.. (1919)

4.49% ❧ Justus Liebig , William Gregory. Animal Chemistry: Or Chemistry in Its Applications to Physiology and Pathology. Printed for Taylor and Walton. (1843)

4.48% ❧ Holmes, Samuel J. (Samuel Jackson), 1868-. The evolution of animal intelligence. New York, H. Holt and company. (1911)

4.48% ❧ Quatrefages de Bréau, Armand de, 1810-1892. The natural history of man: a course of elementary lectures. New York, D. Appleton and company. (1875)

4.47% ❧ Hervey Woodburn Shimer. An Introduction to the Study of Fossils (plants and Animals). Macmillan. (1914)

4.45% ❧ Linville, Henry R. (Henry Richardson), 1866-1941. A textbook in general zoology. Boston ; New York [etc.] : Ginn and Company. (1929)

4.44% ❧ William Lauder Lindsay. Mind in the lower animals, in health and disease v. 2. D. Appleton and Company. (1880)

4.42% ❧ Camille Montmahou , Henri Beauregard. A Course on Zoology: Designed for Secondary Education.. J.B. Lippincott Company. (1892)

4.42% ❧ Ehrlich, Paul, 1854-1915. Experimental researches on specific therapeutics. New York : Hoeber. (1909)

4.42% ❧ Mivart, St. George Jackson, 1827-1900. The common frog. London, Macmillan and co.. (1881)

4.39% ❧ Francis Polkinghorne Pascoe. Zoological classification: a book of reference. (1880)

4.39% ❧ Morris, Charles, 1833-1922. Man and his ancestor; a study in evolution. New York, London, Macmillan. (1900)

4.38% ❧ Stazione zoologica di Napoli. Guide to the aquarium of the Zoological station at Naples. Leipzig : Breitkopf & Härtel. (1896)

4.38% ❧ Robert Patterson. First steps to zoology. Simms and M'Intyre. (1849)

4.37% ❧ Haeckel, Ernst Heinrich Philipp August, 1834-1919. The evolution of man: a popular exposition of the principal points of human ontogeny and phylogeny. New York : D. Appleton and company. (1898)

4.36% ❧ Schmidt (Eduard Oskar ), Eduard Oscar Schmidt. The Doctrine of Descent and Darwinism. H. S. King & co.. (1875)

4.34% ❧ Andrew Wilson. Chapters on Evolution. Chatto & Windus. (1883)

4.34% ❧ Bewick, Thomas, 1753-1828. A general history of quadrupeds : the figures engraved on wood. Newcastle upon Tyne, S. Hodgson, R. Beilby, & T. Bewick. (1800)

4.33% ❧ Westell, William Percival, 1874-1937. The book of the animal kingdom. London, J. M. Dent & sons, ltd.; New York, E. P. Dutton & co.. (1910)

4.33% ❧ Buffon, Georges Louis Leclerc, comte de, 1707-1788. The natural history of oviparous quadrupeds, and serpents. Arr. and published from the papers and collections of the Count de Buffon, by the Count de la Cepede. Edinburgh : Smellie. (1802)

4.3% ❧ Loeb, Jacques, 1859-1924. Comparative physiology of the brain and comparative psychology. New York : Putnam. (1900)

4.3% ❧ Haeckel, Ernst Heinrich Philipp August, 1834-1919. The evolution of man: a popular exposition of the principal points of human ontogney phylogeny. Akron, Ohio : Werner Co.. (1876)

4.28% ❧ Bouverie-Pusey, S. E. B. (Sidney Edward Bouverie), 1839-1911. Permanence and evolution [microform] : an inquiry into the supposed mutability of animal types. London : Kegan Paul, Trench. (1882)

4.25% ❧ Loeb, Jacques, 1859-1924. Comparative physiology of the brain and comparative psychology. New York, G.P. Putman's Sons; [etc., etc.]. (1900)