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41. Delaware - Maryland: Seaford Quadrangle

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1915. United States. Geological Survey. U.S.G.S. Alternate title: Seaford. Relief shown by 10 feet contour interval and spot heights. Surveyed in 1902 an... [Washington, D.C.] : U.S. Geological Survey, 1915.

42. Delaware - Maryland: Wyoming Quadrangle

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1931. United States. Geological Survey. U.S.G.S. Alternate title: Wyoming, Del.-MD. Polyconic projection. Relief shown by 10 feet contour interval and sp... [Reston, Va.] : U.S. Geological Survey, 1931.

43. Delaware: Cape Henlopen Quadrangle

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1918. United States. Geological Survey. U.S.G.S. Alternate title: Del. Cape Henlopen. Polyconic projection. Relief shown by 10 feet contour interval and ... [Washington, D.C.] : U.S. Geological Survey, 1918.

44. Delaware: Cedar Creek Quadrangle

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1918. United States. Geological Survey. U.S.G.S. Alternate title: Cedar Creek. Relief shown by 10 feet contour interval and spot heights. Surveyed in 191... [Washington, D.C.] : U.S. Geological Survey, 1918.

45. Delaware: Cedar Creek Quadrangle

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1918. United States. Geological Survey. U.S.G.S. Alternate title: Cedar Creek, Del. Polyconic projection. Relief shown by 10 feet contour interval and sp... [Washington, D.C.] : U.S. Geological Survey, 1918.

46. Maryland--Delaware: Barclay Quadrangle

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1905. United States. Geological Survey. U.S.G.S. Relief shown by 10 feet contour interval and spot heights. Surveyed in 1904. Verso: Description of the t... [Reston, Va.] : U.S. Geological Survey, 1905.

47. Maryland--Delaware: Pittsville Quadrangle

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1902. United States. Geological Survey. U.S.G.S. Relief shown by 10 feet contour interval and spot heights. Surveyed in 1900 and 1901. Verso: Description... [Reston, Va.] : U.S. Geological Survey, 1902.

48. Maryland--Delaware: Salisbury Quadrangle

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1901. United States. Geological Survey. U.S.G.S. Relief shown by 10 feet contour interval and spot heights. Surveyed in 1900. Verso: Description of the t... [Reston, Va.] : U.S. Geological Survey, 1901.

49. Pennsylvania-Delaware: Coatesville Quadrangle

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1906. United States. Geological Survey. U.S.G.S. Alternate title: Coatesville, PA-DEL. Polyconic projection. Relief shown by 20 feet contour interval and... [Reston, Va.] : U.S. Geological Survey, 1906.