7 books
Morphology of Invertebrate Types (Classic Reprint)
A Synonymic Index-Catalogue of Spiders of North, Central, and South America; With All Adjacent Islands, Greenland, Burmuda, West Indies, Terra del Fuego, Galapagos, Etc
Synonymic Index-Catalogue of Spiders of North, Central and South America
Morphology of Invertebrate Types
The Russian Revolution
Studies of Fossiliferous Amber Arthropods of Chiapas, Mexico
The Russian Revolution. The Jugo-Slav Movement