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Jan 23, 2020
Data
… Industrial Mineral Deposits and Occurrences (AMDO) digital … marl, tufa, phosphate, silica sand, pumicite, sulphur, fly ash, humalite, and sand and gravel. This dataset is part of a …
Dec 31, 1971
Earth Sciences Report
… Lake area is described. The maps and profiles were constructed from existing data and from data collected by a field survey and drilling operations. Good …