- Rare and Hard to Find
- Aquatic Invertebrates
- Archaeology + History
- Botany and Floras
- Evolutionary Biology
- Great Naturalists
- Prints and Maps
- Travel and Exploration
By Darlington, Philip J.
By Goldblatt, Peter (editor)
By Cameron, David W. and Groves, Colin P.
By Goswami, Anjali and Friscia, Anthony (editors)
By Sept, Jeanne and Pilbeam, David (editors)
By Oakley, Kenneth P., Campbell, Bernard G. and Molleson, Theya I. (editors)
By American Philosophical Society
By Clark, G. A. and Willermet, C. M. (editors)