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Publisher
- Martenet, Simon J.1
- Maryland Geological Survey (Baltimore, Md.?)1
- Maryland Geological Survey (BaltimoreĢ)1
- Maryland Historical Society (Baltimore, Md)1
- Maryland. Conservation Department.1
- Maryland. State Department of Forestry.1
- National Geographic Society (Washington, D.C)1
- Published by Scho?nberg & Co., New York (New York)1
- Rand McNally and Company1
- S.A. Mitchell (Philadelphia)1
- Senex, John1
- Simmons, Isaac1
- Southern Maryland Development Company1
- The Association (Washington, D.C)1
- Tyson, Henry1
- U.S. Geological Survey (Washington, D.C)1
- U.S. Geological Survey (Washington?)1
- Warner & Hanna1
- Weishampel, J.F.1