This paper gave a resume of the known facts in the geographical distribution of these small Unios and proposed the reduction of a number of forms to synonymy.
Proceedings of the Iowa Academy of Sciences
©1888 Iowa Academy of Science, Inc.
Call, R. Ellsworth
"The Parvus Group of Unionidae,"
Proceedings of the Iowa Academy of Science, 1(Pt. 1), 45-51.
Available at: https://scholarworks.uni.edu/pias/vol1/iss1/24