Philadelphia, Blakiston[1919]

New York,1908. | New York Botanical Garden, LuEsther T. Mertz Library

Philadelphia, Blakiston[1916]

Philadelphia, P. Blakiston's Son & Co., 1920.

Chicago,The Open Court Publishing Co.,1910

Chicago,The Open Court Publishing Co.,1910.

Chicago, The Open Court Publishing Co., 1910

Chicago, The Open Court Publishing Co., 1910.

Brooklyn?1917 | New York Botanical Garden, LuEsther T. Mertz Library

article by C. Stuart Gager published in Creation by Evolution, 1928