Phosphate rock(in two parts) :

Author: Ruhlman, E. Robert
Additional Authors: Ruhlman, E. R.
Year: 1958
Document Type: USBI
Issuing Agency: U.S. Dept. of the Interior, Bureau of Mines,
Series: Information circular / United States. Bureau of Mines ;
Report Number: 7814
Link: https://hdl.handle.net/2027/mdp.39015078466086

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