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- The Survey ; For sale by Map Distribution17
- The Survey13
- Geological Survey of Canada7
- The Survey ; For sale by Information Services7
- U.S. Dept. of the Interior, U.S. Geological Survey5
- Md. Geological Survey4
- State of Md., Dept. of Natural Resources, Md. Geological Survey4
- U.S. Geological Survey4
- The Survey ; Information Services [distributor]3
- CPRM, Serviço Geológico do Brasil1
- Dept. of Lands & Surveys1
- Dept. of Natural Resources, Md. Geological Survey1
- Dept. of Water Affairs, Ministry of Energy and Water Development, Zambia ; Federal Institute for Geosciences and Natural Resources, BGR1
- Dept. of the Interior, U.S. Geological Survey1
- Geological Survey Dept1
- Minnesota Geological Survey1
- Minnesota Geological Survey, University of Minnesota1
- Research Council of Alberta1
- State of Md., Dept. of Natural Resources, Md. Geological Survey, Williams & Heintz Map Corp.)1
- Survey Dept1
