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- Adam Matthew Digital (Firm), digitiser23
- Willis, Nathaniel Parker, 1806-186712
- Condy, Jonathan Williams, 1770-18284
- Maryland. Susquehanna Canal Commissioners4
- Smith, Richard, 1735-18034
- Barker, W. (William), active 1795-18033
- Myers, Richmond E.3
- Bartlett, W. H. (William Henry), 1809-18542
- Bland, Theodorick, 1777-18462
- Cadzow, Donald A.2
- Darrell, Linda C.2
- Geological Survey (U.S.)2
- Gossler, Jacob L.2
- Halsey, Francis W. (Francis Whiting), 1851-19192
- Hostelley, Alfred Edward2
- Maclay, Samuel, 1741-18112
- Maryland. Tidewater Ecosystem Assessment2
- Perkins, George A., Mrs., 1799-18842
- Tonkin, Joseph Dudley2
- Bache, A. D. (Alexander Dallas), 1806-18671