Books by Roger Sperka:
Books in the extended shelves:
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Sperka, Roger: Hydrology of the shallow aquifer and uppermost semiconfined aquifer near El Paso, Texas (U.S. Dept. of the Interior, U.S. Geological Survey ;, 1997), also by Donald Edward White, E. T. Baker, Geological Survey (U.S.), and El Paso (Tex.). Water Utilities and Public Service Board (page images at HathiTrust)
Find more by Roger Sperka at your library, or elsewhere.