Ecology of Polluted Water presentation slides

Set of 55 color slides in 1 box labeled ECOL. Poll. H2O 1/3 or Ecology of Polluted Water. Part of the Cal R. Fremling collection. Slides are numbered consecutively, but otherwise unlabeled. Exact location and creation dates are unknown. Some slides based on pictures taken or presentations created by Fremling, others taken by other unknown creators and used for educational illustrative purposes (noted with Photograph/art print/etc of ). Slide subject is a presentation created by Dr. Fremling titled The Ecology of Polluted Water, built from slides chosen from previous boxes/containers in the Fremling collection. Specific subjects covered include water types, water pollution and effects of pollution (including fish die-offs), factories, different types of pollutants, factories, different types of pollutants, water plants, fungi and bacteria, wildlife, farms and livestock, rock formations, aerial views, scientific sample gathering, fishing, and family recreation. Slides are printed and presentation produced by Nasco of Fort Atkinson. Printing date is unknown, possibly 1980-2000.https://openriver.winona.edu/calfremlingslidesall/1015/thumbnail.jp