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Institution
Collection
Subject
2
Architecture and energy conservation
2
Buildings Environmental engineering
2
Delaware Altitudes
2
Geology
2
Groundwater
2
Maryland Altitudes
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2
Parks
2
Public buildings Energy conservation
2
Stream measurements Cost effectiveness
2
Virginia Altitudes
2
Washington (D.C.)
2
Washington (D.C.) Altitudes
2
Washington (D.C.) History
1
Acid rain
1
African Americans
1
Amphibians
1
Automobiles Seat belts
1
Biological stations
1
Buildings
1
Canals Conservation and restoration
1
Canals Design and construction
1
Canals Recreational use History
1
Chesapeake and Ohio Canal (Md. and Washington, D.C.) History
1
Chesapeake and Ohio Canal (Md. and Washington, D.C.) Recreational use History
1
Chesapeake and Ohio Canal National Historical Park History
1
Chesapeake and Ohio Canal National Historical Park Planning
1
Chesapeake and Ohio Canal National Historical Park Recreational use
1
Coastal plains
1
Delaware
1
Earth sciences Information services
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Author
7
Geological Survey (U.S.)
5
Geological Survey (U.S.),
4
United States. National Park Service
2
Gillen, D. F.
2
James, R. W.
2
United States. Department of Energy
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1
Bell, Joseph M. (Geologist),
1
Bolden, Tonya,
1
Carpenter, David H.
1
Carpenter, David H.,
1
Chanat, Jeffrey G.,
1
Chesapeake and Ohio Canal National Historical Park (Agency : U.S.),
1
Darton, Nelson Horatio, 1865-1948
1
Elmes, Diana
1
Exxon Mobil Corporation
1
Fenneman, Nevin Melancthon, 1865-1945
1
Fleck, William B.
1
Fleck, William B.,
1
Girty, George Herbert, 1869-1939
1
Herrmann, Thomas E.
1
Junior Ranger Program (United States. National Park Service)
1
Luzader, John F.,
1
Mackintosh, Barry
1
Maclin, Lillian B.
1
Marshall, R. B. 1867-1949
1
Marshall, R. B. 1867-1949,
1
McGrew, Dallas D. L.
1
Miller, Cherie V.,
1
Montgomery County (Md.)
1
Nissen, William J.
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Language
Genre
Literary Form
Region
Maryland
Washington (D.C.)
9
Delaware
6
Virginia
4
United States
2
Chesapeake and Ohio Canal (Md. and Washington, D.C.)
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2
Chesapeake and Ohio Canal National Historical Park
2
Germantown (Montgomery County)
1
Alaska
1
Arizona
1
Arkansas
1
Illinois
1
Maine
1
Middle Atlantic States
1
Mississippi
1
Missouri
1
New Hampshire
1
New Jersey
1
New Mexico
1
Oklahoma
1
Oxon Cove Park (Md. and Washington, D.C.)
1
Pennsylvania
1
Prince George's County
1
Seward Peninsula
1
Utah
1
Vermont
1
West Virginia
1
Wyoming
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