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Dec 31, 1977
Bulletin
… upon the amount of vailable data. The main items on a typical … The sources of basic data include water well drillers'' …
Dec 31, 1957
Bulletin
… used by Greenwalt (1956); the data on which it is based were … in the econstruction, and the data utilized to be within an … sediments were deposited. The data available on which to base …