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Photographic image
Pat Kelsey (left) and Rick Hootman using the Atomic Absorption Spectrophotometer to test for heavy metal and salt contaminants in the lab1980s
Kohout, John
Photographic image
Pat Kelsey (left) and Rick Hootman using the Atomic Absorption Spectrophotometer to test for heavy metal and salt contaminants in the lab1980s
Kohout, John
Photographic image
Li-Cor portable photosynthesis system in the field, measuring chlorosis1980s
Irving, Gary
Document
Illinois Natural History Survey: Results of an Investigation on Endangered Plants Without Known Extant Populations, and Recommendations for Changes in Their Listing StatusMarch 11 1988
Bowles, Marlin L., Robertson, Kenneth R., Burton, Philip J., Ketzner, David M., Solecki, Mary Kay, Taft, John B., Ulaszek, Eric F.