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Set of 4 color slides in 1 container labeled "Slides from Rada Mayfly Graphs." Part of the Cal R. Fremling collection. Slides are mostly unlabeled and not numbered consecutively. Exact location and creation dates are unknown. Some slides based on pictures taken by Fremling, others taken by other unknown creators and used for educational illustrative purposes (noted with "Photograph/art print/etc of"). Slides show graphs and tables concerning water quality (Upper Mississippi River specified in one slide), over time spans ranging from 1934-1990. Slide print dates are unknown, probably around 1985-1990.
Biologists; Science; Upper Mississippi River
Fremling, Cal R., "Slides from Rada/Mayfly graphs slides" (1970). Cal Fremling Slides. 18.