"Crayfishes of the Cheat River Watershed in West Virginia and Pennsylvania. Part II. Observations upon ecological factors relating to distribution."; "Schwartz, Frank J.", "Meredith, William Glenn, 1933-"; "Crayfish--Pennsylvania.", "Crayfish--West Virginia.", "Crayfish--Cheat River Watershed (W. Va. and Pa.)"; "Schwartz, Frank J.", "Meredith, William Glenn, 1933-"; "1962"; "Journal article reprint from: The Ohio Journal of Science, 62:5 (1962:Sept.)."; ""; "P7779"; "pec"; "Crayfish--Pennsylvania.", "Crayfish--Cheat River Watershed (W. Va. and Pa.)", "Crayfish--West Virginia."; "14256"; .