General Interest Article
Proceedings of the Iowa Academy of Science
© Copyright 1956 by the Iowa Academy of Science, Inc.
"Proceedings of the Sixty-Eighth Meeting of the Iowa Academy of Sdence Held at Grinnell College, Grinnell, Iowa, April 20 and 21, 1956: Minutes of the 1956 Meeting,"
Proceedings of the Iowa Academy of Science: Vol. 63:
, Article 4.
Available at: https://scholarworks.uni.edu/pias/vol63/iss1/4