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Publisher
- Geological Survey (U.S.)274
- Geological Survey Division (Urbana, Ill.)223
- East View Cartographic, Inc.34
- The Survey (Washington, D.C)32
- U.S. Geological Survey (Washington, D.C)32
- The Survey (Washington)15
- State Geological Survey (Urbana, Ill.)9
- Bureau of Geology and Mines (Rolla, Mo.)6
- The Survey (Washington, D.C)6
- U.S. Geological Survey (Washington, D.C.)6
- Kentucky Geological Survey (Lexington, Ky.)5
- U.S. Geological Survey (Washington)5
- The Survey4
- U.S. Geological Survey (U.S.)4
- War Dept., Corps of Engineers, U.S. Army (U.S.)4
- Dept. of the Interior, U.S. Geological Survey (Washington, D.C)3
- Geological Survey Division (Urbana, Ill)3
- Geological and Natural History Survey (Madison, Wis.)3
- Geological Survey (Washington, D.C)2
- State of Missouri Bureau of Geology and Mines (Rolla, Mo.)2