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- Public30
- English30
- Renshawe, John H5
- C.S. Hammond & Company3
- Maryland Geological Survey2
- McGee, W. J., 1853-19122
- United States. Department of Agriculture. Division of Publications2
- Appalachian Mountain Club1
- Brooks, Alfred H. (Alfred Hulse), 1871-19241
- C.S. Hammond & Company.1
- Darton, Nelson Horatio, 1865-19481
- Dinsmore, A. F1
- Roads--Connecticut--Maps3
- Geology--United States--Maps2
- Election districts--Maryland--Allegany County--Maps1
- Gas fields--Pennsylvania--Maps1
- Groundwater--Missouri River Watershed--Maps1
- Irrigation--United States--Maps1
- Oil fields--Pennsylvania--Maps1
- Petroleum pipelines--Pennsylvania--Maps1
- Petroleum refineries--Pennsylvania--Maps1
- Railroads--Connecticut--Maps.1
- Geological Survey (U.S.)✖[remove]30
- U.S. Coast and Geodetic Survey4
- Ashe, W. W. (William Willard), 1872-1932. Southern Appalachian forests1
- Ayres, H. B. (Horace Beemer), b. 1856. Southern Appalachian forests1
- Baltimore Harbor Board1
- Baltimore Topographic Survey1
- Bauman, Wm. (William)1
- Bien, Julius, 1826-19091
- Brooks, Alfred H1
- Gannett, Henry, 1846-19141
Current results range from 1883 to 1966
