Books by L. Penrod:
Books in the extended shelves:
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Penrod, L.: Feasibility of overland flow for treatment of raw domestic wastewater (National Environmental Research Center, Office of Research and Development,U.S.Environmental Protection Agency; for sale by the Supt. of Docs.,U.S.Govt.Print.Off., 1974), also by R. E. Thomas, K. Jackson, Corvallis National Environmental Research Center, and United States. Environmental Protection Agency. Office of Research and Development (page images at HathiTrust)
Find more by L. Penrod at your library, or elsewhere.