ebrary, Inc 992 Films for the Humanities & Sciences (Firm) 876 Films Media Group 872 Adam Matthew Digital (Firm) 796 De Gruyter 755 National Science Foundation (U.S.) 670 SpringerLink (Online service) 647 Edgar Fahs Smith Memorial Collection (University of Pennsylvania) 569 Library of Congress Congressional Research Service 556 ProQuest (Firm) 462 William B. Provine Collection on Evolution and Genetics 443 National Academy of Sciences (U.S.) 412 Edward Potts Cheyney Memorial Fund 411 Royal Society (Great Britain) 396 WPA Film Library 388 Bacon, Francis, 1561-1626 380 National Center for Education Statistics 368 Descartes, René, 1596-1650 350 History of Science Collection (Brown University) 314 American Association for the Advancement of Science 311 Unesco 299 Educational Resources Information Center (U.S.) 277 Huxley, Thomas Henry, 1825-1895 259 Royal Society of Chemistry (Great Britain) 256 Boyle, Robert, 1627-1691 241 David E. Pingree Collection (Brown University) 227 O'Sullivan, Christine Y 224 Alexander Street Press 203 United States Congress 202 Humboldt, Alexander von, 1769-1859 192 Educational Testing Service 186 United States Congress. House. Committee on Science and Astronautics 185 National Science Teachers Association 167 United States Office of Educational Research and Improvement 164 Organisation for Economic Co-operation and Development 162 AM (Publisher) 161 Mark B. Adams Emergence of Modern Science Collection (University of Pennsylvania) 159 National Research Council (U.S.) 158 Académie des sciences (France) 153 National Assessment of Educational Progress (Project) 146 ProQuest ebook central 141 Tyndall, John, 1820-1893 141 Needham, Joseph, 1900-1995 140 Glasshead Productions 135 Aristotle 132 Smithsonian Institution 129 Brook Lapping Productions 125 Descartes, René, 1596-1650 125 History of Medicine Collection (David M. Rubenstein Rare Book & Manuscript Library) 125 Whitehead, Alfred North, 1861-1947 125 Akademii︠a︡ nauk SSSR 121 Helmholtz, Hermann von, 1821-1894 121 American Philosophical Society 115 Harvard University Graduate School of Education 115 Académie des sciences (France) 114 Gotham Book Mart Collection (University of Pennsylvania) 114 Sarton, George, 1884-1956 114 National Science Foundation (U.S.) Division of Science Resources Studies 110 Poincaré, Henri, 1854-1912 109 New York Academy of Sciences 108 Cambridge University Press 105 EBSCOhost 105 United States National Aeronautics and Space Administration 105 Mill, John Stuart, 1806-1873 103 United States Congress. House. Committee on Science and Astronautics. Subcommittee on Science, Research, and Development 102 Royal College of Physicians of London 100 Centre national de la recherche scientifique (France) 99 Institut istorii estestvoznanii︠a︡ i tekhniki (Akademii︠a︡ nauk SSSR) 98 James Hosmer Penniman Book Fund 98 Asimov, Isaac, 1920-1992 97 Cardano, Girolamo, 1501-1576 97 Kungl. Svenska vetenskapsakademien 96 Martinet, J. F (Joannes Florentius), 1729-1795 96 National Academy of Engineering 93 Alumni and Friends Memorial Book Fund 91 Culture Class Collection (University of Pennsylvania) 91 United States Congress. House. Committee on Foreign Affairs 91 Wolff, Christian, Freiherr von, 1679-1754 91 Rosengarten Family Fund 87 Unesco Science Cooperation Office for Latin America 87 American Society for Testing and Materials 85 ERIC Clearinghouse for Science, Mathematics, and Environmental Education 83 Institut filosofii (Akademii︠a︡ nauk SSSR) 83 Haldane, J. B. S (John Burdon Sanderson), 1892-1964 82 Institute of Medicine (U.S.) 81 National Institute of Education (U.S.) 81 Whewell, William, 1794-1866 81 United States Joint Publications Research Service 80 ASTM International 79 Popper, Karl R (Karl Raimund), 1902-1994 78 United States Congress. House. Committee on Science 78 Porta, Giambattista della, approximately 1535-1615 77 Russell, Bertrand, 1872-1970 77 Prelinger Archives (Firm) 76 Bronowski, Jacob, 1908-1974 75 Institute for Scientific Information 75 Martin, Benjamin, 1705-1782 75 British Association for the Advancement of Science 74 Taylor & Francis 74 United States 73