nemfrog: Fig. 138. “By systematic selection the average grade of a race of Dutch rabbits may be gradually but permanently changed…” Genetics and eugenics : a text-book for students of biology and a reference book for animal and plant breeders.

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nemfrog: Fig. 138. “By systematic selection the average grade of a race of Dutch rabbits may be gradually but permanently changed…” Genetics and eugenics : a text-book for students of biology and a reference book for animal and plant breeders.

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