Phosphate rock in Colombia - a preliminary report, with a section on the phosphate occurrence at Turmeque
- James Bachelder Cathcart, Francisco Zambrano O., Mojica G. Pedro E.
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- Phosphate rock in Colombia - a preliminary report, with a section on the phosphate occurrence at Turmeque
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- U.S. Govt. Print. Off.,
- p. A1-A77, illus., maps (3 fold. in pocket) ;24 cm.