||The Origin of Variations, Symposium at the Thirty-ninth Annual Meeting of the American Society of Naturalists, Toronto, December 29, 1921
||Blakeslee, Albert Francis
||The American Naturalist, Vol. LVI, Jan.-Feb., 1922, pp. 16-31
|| * First separate edition. Offprint. Original wrappers. Karl Sax and E.M. East ownership stamps front cover. Compliments stamp. Very good.