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1
[Washington, DC : United States Environmental Protection Agency, Indoor Environments Division 2002
4th ed.

Government Document Electronic Book
2
[University Park, Penn.] : [Harrisburg, Penn.] : Penn State Broadcasting ; PA Department of Environmental Protection, 2003

Government Document Electronic Book
3
[Harrisburg, Pa.] : Pennsylvania Department of Education, 1997

Government Document Electronic
4
Fredericksburg, Va. : U.S. Army Corps of Engineers, Mobile district with technical assistance from Marstel Day Conservation & Consulting, 2010

Government Document Electronic
5
[Washington, D.C.] : [Reston, Va.] : U.S. Fish and Wildlife Service ; U.S. Geological Survey, 1999

Government Document Electronic Book
6
University Park, Pa. : Pennsylvania Public Library Film & Video Center, 1998

Government Document Electronic Journal
7
[Harrisburg, PA] : Pennsylvania, Department of Transportation, 2005

Government Document Electronic Book
8
Detroit : Gale Research Inc., 1995

Electronic Book
9
[Brussels, Belgium] : FIAF, 2002
2002 ed.

Electronic Book
10
[Washington, D.C.] : U.S. Dept. of Energy, 1994

Government Document Electronic Serial
11
Washington, D.C. : Columbia Books, 1995
Version 1.0

Electronic Book
12
[Washington, D.C.] : U.S. Dept. of Agriculture, National Agricultural Statistics Service, 2009

Government Document Electronic Book
13
Reading, PA : Reading Area Community College, 2001

Electronic Book
14
Middletown, PA : Pennsylvania State Data Center, 1999

Government Document Electronic Book
15
Washington, DC : The Commission, 2000

Electronic Book
16
Washington, DC : Office of Toxic Substances, 1989

Government Document Electronic Journal
17
East Brunswick, NJ : GeoLytics, 1999
Version 3.0

Electronic Book
18
Washington, D.C. : U.S. Patent & Trademark Office, OCIO, Information Products Division, 2001

Government Document Electronic Journal
19
Philadelphia, Pa. : Environmental Fund for Pennsylvania, 2000

Government Document Electronic Journal
20
[Washington, DC] : U.S. Dept. of Agriculture, Food Safety and Inspection Service, 2011

Government Document Electronic Book