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Institution
Collection
Format
Subject
14
Groundwater
11
Geology
11
Maryland
10
Historic sites
10
National parks and reserves
10
Water quality
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9
Groundwater Pollution
8
Groundwater flow
7
Hydrogeology
7
Stream measurements
6
Hydrology
6
Research
6
Water Pollution
6
Wildlife refuges
5
Antietam National Battlefield (Md.)
5
Geology, Stratigraphic
5
Groundwater Quality
5
Information services
5
Landscape protection
5
Officials and employees
4
Eastern Neck National Wildlife Refuge (Md.)
4
Historic buildings
4
History
4
Nutrient pollution of water
4
Paleontology
4
Water consumption
3
Aberdeen Proving Ground (Md.)
3
Amphibians
3
Bird refuges
3
Blackwater National Wildlife Refuge (Md.)
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Author
70
Geological Survey (U.S.)
22
United States. National Park Service
17
U.S. Fish and Wildlife Service
10
Aberdeen Proving Ground (Md.). Environmental Conservation and Restoration Division
10
National Institutes of Health (U.S.)
7
Goddard Space Flight Center
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6
Maryland Geological Survey
6
National Cancer Institute (U.S.)
6
National Institutes of Health (U.S.). Clinical Center
5
Lorah, Michelle M.
5
Maryland. Department of the Environment
4
Hayes, Donald C.
4
Maryland. Department of Natural Resources
4
National Institutes of Health (U.S.). Office of Clinical Center Communications
4
Tenbus, Frederick J.
4
United States. National Park Service,
4
Vroblesky, Don A.
4
Wheeler, Judith C.
3
Banks, William S. L.
3
Delaware. Department of Transportation
3
Dillow, Jonathan J. A.
3
Fisher, Gary T.
3
Fleck, William B.
3
Herb, William J.
3
Maryland. Department of Transportation
3
Minard, James P.
3
National Library of Medicine (U.S.)
3
Phelan, Daniel J.
3
United States. Department of the Army
3
United States. Environmental Protection Agency
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Language
Genre
2
Conference papers and proceedings
2
Directories
2
Guidebooks
2
Handbooks and manuals
2
Maps
2
Statistics
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1
Architectural drawings
1
Bibliographies
1
Biographies
1
Case studies
1
Catalogs
1
Congresses
1
Databases
1
Designs and plans
1
Exhibition catalogs
1
Gazetteers
1
Identification
1
Literature
1
Longitudinal studies
1
Trivia and miscellanea
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Literary Form
Era
Region
Maryland
35
Bethesda
22
Virginia
17
Aberdeen Proving Ground
13
Delaware
12
Pennsylvania
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11
United States
10
Baltimore
10
Washington (D.C.)
7
Greenbelt
7
West Virginia
6
Patuxent River Watershed
5
Antietam National Battlefield
5
Antietam National Battlefield (Md.)
4
Baltimore Metropolitan Area
4
Chesapeake and Ohio Canal National Historical Park
4
Chincoteague National Wildlife Refuge (Va. and Md.)
4
Eastern Neck National Wildlife Refuge (Md.)
3
Aberdeen
3
Aberdeen Proving Ground (Md.)
3
Adelphi
3
Baltimore Region
3
Beltsville
3
Blackwater National Wildlife Refuge (Md.)
3
Fort McHenry National Monument and Historic Shrine (Baltimore, Md.)
3
Harpers Ferry National Historical Park
3
Laurel
3
Montgomery County
3
Patuxent River
2
Alaska
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Call Number
40
H - Social Science
33
Q - Science
25
G - Geography, Anthropology, Recreation
22
D - World History
13
T - Technology
12
F - General American History
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8
A - General Works
6
E - United States History
6
N - Fine Arts
3
C - Historical Sciences
2
J - Political Science
2
K - Law
1
L - Education
1
V - Naval Science
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Year of Publication