Books by Robert Valentine Sobczak:
Books in the extended shelves:
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Sobczak, Robert Valentine: Water quality in Big Cypress National Preserve and Everglades National Park : trends and spatial characteristics of selected constituents (U.S. Geological Survey, 2004), also by Ronald L. Miller, Benjamin F. McPherson, United States Department of the Interior, and Geological Survey (U.S.) (page images at HathiTrust)
Find more by Robert Valentine Sobczak at your library, or elsewhere.