Books by Jack R. Geckler:
Books in the extended shelves:
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Geckler, Jack R.: Glossary of commonly used biological and related terms in water and waste water control (Division of Water Supply and Pollution Control, 1963), also by United States Division of Water Supply and Pollution Control (page images at HathiTrust)- Geckler, Jack R.: Validity of laboratory tests for predicting copper toxicity in streams (Environmental Protection Agency, Office of Research and Development, Environmental Research Laboratory ;, 1976), also by United States. Environmental Protection Agency. Office of Research and Development (page images at HathiTrust)
Find more by Jack R. Geckler at your library, or elsewhere.