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241by Ryder, Robert T.“...United States Appalachian Basin. fast (OCoLC)fst01251334...”
Published 2006
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242by Grover, Nathan Clifford, 1868-1956“...United States Monongahela River Watershed. fast (OCoLC)fst01310896...”
Published 1926
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243by Grover, Nathan Clifford, 1868-1956, Hartwell, O. W., Horton, A. H. (Albert Howard), 1875-1945, Lee, Lasley, 1887-, Hartwell, Oliver W. (Oliver Whitcomb), 1886-“...United States Monongahela River Watershed. fast (OCoLC)fst01310896...”
Published 1925
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