Incident to the year's collection of Iowa plants, about 15 additional species and varieties may be added to the first supplement issued in January, 1940.
Proceedings of the Iowa Academy of Science
©1941 Iowa Academy of Science, Inc.
"A Second Supplement to the Catalogue of Plants in the Iowa State College Herbarium (Abstract),"
Proceedings of the Iowa Academy of Science, 48(1), 193-193.
Available at: https://scholarworks.uni.edu/pias/vol48/iss1/26