article by Edwin Grant Conklin published in Creation by Evolution, 1928

Philadelphia, 1912.

New YorkD. Appleton1907

New York :D. Appleton,1898.

New York: D. Appleton, 1898

New York: D. Appleton, 1898.

Princeton: Princeton University Press ;1919.

Philadelphia, 1902.

[Princeton, N.J.]: Princeton University Press, [19-?]

monograph published in 1900

Boston, Ginn & company, 1897.

Philadelphia: [Academy of Natural Sciences], 1905.