Series

Notulae Naturae of The Academy of Natural Sciences of Philadelphia.

Articles

1. Olsson, A.A. & Wurtz, C.B., 1951. New Colombian Naiades, with Observations on Other Species: [1]-8.
2. Moore, J.P., 1952. Professor A. E. Verrill's Fresh-Water Leeches - A Tribute and a Critique, 29 Oct 1952: [1]-15.