Walton, W. C. (1970). Groundwater resource evaluation. McGraw-Hill.
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Dyfyniad Arddull Chicago
Walton, William Clarence. Groundwater Resource Evaluation. New York: McGraw-Hill, 1970.
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Dyfyniad MLA
Walton, William Clarence. Groundwater Resource Evaluation. McGraw-Hill, 1970.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.