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- Reserves of Phosphate in the Land-Pebble Phosphate Field, Hardee, Hillsborough, Manatee, Osceola, Pasco, and Polk Counties, Florida
- From abstract: Investigations of the land-pebble phosphate deposits of Florida by the Geological Survey began in November 1947. This report presents the computation of reserves of phosphate rock in the northern part of the district.