6 books
Contributions to North American Ichthyology Based Primarily on the Collections of the United States National Museum, Vol. 2: A. Notes on Cottidae, Etheostomatidae, Percidae, Centrarchidae, Aphododeridae, Dorysomatidae, and Cyprinidae, With Revisions of th
Twentieth Century Text-Books. Animal Forms; A Text-Book of Zoology
The True Basis of Economics
The Psychology of War
Animal Forms Animal Forms
Animal Forms