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Set of 35 color slides in 1 box labeled "Water Extras." 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 subjects including: water insects, water pollution, different types of pollutants, wildlife, mayflies, aerial photographs, locks and dams, litter, wells, caves, diagrams, Lake Itasca, and Horseshoe Falls Crest (Niagara Falls tourist slide). Many slides are duplicates or different angles from slides found in other boxes/containers in collection. Known slide print dates are 1954-85.
Biologists; Science; Upper Mississippi River; Geology; Minnesota Maps; Water Pollution; Wildlife; Oil spill; Oil pollution of rivers; harbors; etc.; Water Pollution; Mississippi River; Mississippi River Aerial Photograph; Aerial Photographs
Fremling, Cal R., "Water extras slides" (1970). Cal Fremling Slides. 20.