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books.google.com - Comparative Vertebrate Reproduction is the only comprehensive textbook covering major topics in the reproductive biology of vertebrates, from sexuality and gametogenesis to reproductive ecology and life history tactics. The work draws heavily on recent reviews and papers while placing topics in a historical...http://books.google.com/books/about/Comparative_Vertebrate_Reproduction.html?hl=ja&id=cqQX9RMPAegC&q=penis&utm_source=gb-gplus-shareComparative Vertebrate Reproduction