1![Journal of the History of Biology: 209–237 DOIs10739y SpringerStephen Jay Gould, Jack Sepkoski, and the ‘Quantitative Journal of the History of Biology: 209–237 DOIs10739y SpringerStephen Jay Gould, Jack Sepkoski, and the ‘Quantitative](https://www.pdfsearch.io/img/1ebf58433451b72a5f2b06c10077488d.jpg) | Add to Reading ListSource URL: www.stephenjaygould.orgLanguage: English - Date: 2015-12-04 05:48:34
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2![national academy of sciences George gaylord Simpson 1902—1984 national academy of sciences George gaylord Simpson 1902—1984](https://www.pdfsearch.io/img/cb7bad5f92680155637bd549c5271eeb.jpg) | Add to Reading ListSource URL: www.nasonline.orgLanguage: English - Date: 2014-11-07 15:26:03
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3![What history tells us X. Fifty years ago: the beginnings of exobiology 1083 What history tells us X. Fifty years ago: the beginnings of exobiology 1083](https://www.pdfsearch.io/img/3d2a63e7a1f2e6970659bb6e958cb2ec.jpg) | Add to Reading ListSource URL: www.ias.ac.inLanguage: English - Date: 2007-09-28 07:41:39
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4![national academy of sciences George gaylord Simpson 1902—1984 national academy of sciences George gaylord Simpson 1902—1984](https://www.pdfsearch.io/img/08db1ef6f1628897bbc629eed0d86693.jpg) | Add to Reading ListSource URL: www.nasonline.orgLanguage: English - Date: 2012-08-24 12:52:58
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5![One who created a tempo of his own George Gaylord Simpson: Paleontologist and Evolutionist by Leo F. Laporte One who created a tempo of his own George Gaylord Simpson: Paleontologist and Evolutionist by Leo F. Laporte](https://www.pdfsearch.io/img/e36d4578e8b8a49a94a70ce0e47de8bc.jpg) | Add to Reading ListSource URL: www.nature.comLanguage: English - Date: 2009-04-23 11:11:03
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6![Simpson G G. The principles of classification and a classification of mammals.Bull. Am. Mus. Nat. Hist. 85:[removed]. Simpson G G. The principles of classification and a classification of mammals.Bull. Am. Mus. Nat. Hist. 85:[removed].](https://www.pdfsearch.io/img/979b957feba0adfcee3528bb89bfe0ba.jpg) | Add to Reading ListSource URL: garfield.library.upenn.eduLanguage: English - Date: 2003-09-05 17:31:53
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