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Before 1875
1875-1900
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  Main Author:   Mathews, Edwards Bennett
  Title/Description:   Map of Maryland Showing State Road System
  Publication Info:   Baltimore: Maryland Geological Survey, 1930
  Date:   1930
  Scale:   1:312,500
  Original Source:   Courtesy of Murray Hudson, Halls, Tennessee
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  Main Author:   Maryland Geological Survey
  Title/Description:   Map of Maryland Showing Geological Formation
  Publication Info:   Baltimore: Maryland Geological Survey, 1933
  Date:   1933
  Scale:   1:380,160
  Original Source:   Geological Survey of Alabama
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  Main Author:   Maryland Geological Survey
  Title/Description:   Map of Maryland Showing Surface Elevation
  Publication Info:   Baltimore: Maryland Geological Survey, 1935
  Date:   1935
  Scale:   1:380,160
  Original Source:   Geological Survey of Alabama
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  Main Author:   Darton, N.H.
  Title/Description:   Map Showing the Distribution of Gravel and Sand Deposits of Northeastern Maryland
  Publication Info:   Washington: Department of the Interior, U.S. Geological Survey, 1938; Bulletin 906, Plate 9
  Date:   1938
  Scale:   1:62,500
  Original Source:   Geological Survey of Alabama
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  Main Author:   Darton, N.H.
  Title/Description:   Map Showing Distribution of Gravel and Sand Deposits in the Region Southeast and South of Washington, D.C.
  Publication Info:   Washington: Department of the Interior, U.S. Geological Survey, 1938; Bulletin 906, Plate 10
  Date:   1938
  Scale:   1:62,500
  Original Source:   Geological Survey of Alabama
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  Main Author:   Darton, N.H.
  Title/Description:   Map Showing the Distribution of Sand and Gravel Deposits in the Region Between Washington, D.C. and Baltimore, MD
  Publication Info:   Washington: Department of the Interior, U.S. Geological Survey, 1938; Bulletin 906, Plate 6
  Date:   1938
  Scale:   1:62,500
  Original Source:   Geological Survey of Alabama
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  Main Author:   Maryland Geological Survey
  Title/Description:   Geologic Map of Maryland
  Publication Info:   Baltimore: Maryland Geologic Survey, 1968
  Date:   1968
  Scale:   1:250,000
  Original Source:   Geological Survey of Alabama
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