- Divisão de Fomento da Produção Mineral19
- The Survey ; For sale by Branch of Distribution, USGS19
- The Survey : [Books and Open-file Reports Section, distributor]18
- U.S. Geological Survey ; Books and Open-File Reports Section, distributor17
- Printed by the Government Printer16
- Egyptian Mineral Resources Authority15
- Interior--Geological Survey15
- Mineral Development Division, Department of Mines and Energy13
- U.S. Dept. of the Interior, Geological Survey12
- Bureau of Geology and Topography, Mines and Geology Branch11
- Research Council of Alberta11
- Geological Society of America10
- Mineral Development Division10
- North Dakota Geological Survey10
- U.S. Department of the Interior, U.S. Geological Survey10
- U.S. Geological Survey ; Information Services [distributor]10
- United States Geological Survey10
- Ontario Dept. of Mines9
- U.S. Dept. of the Interior, U.S. Geological Survey ; For sale by U.S. Geological Survey, Information Services9
- Wisconsin Geological and Natural History Survey, University of Wisconsin-Extension9
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