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Article written by Cal Fremling discussing freshwater free diving or shallow water diving, teaching biology students, diving equipment, field trips, and the collection of crayfish and other biological materials from freshwater sources for classroom and laboratory use. Reprinted from The American Biology Teacher, February 1954, volume 16, number 2, pages 48-49. Part of the Cal R. Fremling Collection.
Swimming; Biologists; Students; Equipment; Laboratory
Fremling, Cal R., "A new biological frontier: your favorite lake" (1954). Cal Fremling Papers. 7.
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