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Schwartz, Joel S. (1974). «Charles Darwin's Debt to Malthus and Edward Blyth». Journal of the History of Biology. 7 (2): 301–318. JSTOR4330617. PMID11609303. doi:10.1007/bf00351207
jstor.org
Schwartz, Joel S. (1974). «Charles Darwin's Debt to Malthus and Edward Blyth». Journal of the History of Biology. 7 (2): 301–318. JSTOR4330617. PMID11609303. doi:10.1007/bf00351207
Schwartz, Joel S. (1974). «Charles Darwin's Debt to Malthus and Edward Blyth». Journal of the History of Biology. 7 (2): 301–318. JSTOR4330617. PMID11609303. doi:10.1007/bf00351207