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1
Washington, DC : U.S. Dept. of Commerce, Bureau of the Census, Data User Services Division, 1991

Government Document Electronic
2
[Washington, DC : United States Environmental Protection Agency, Indoor Environments Division 2002
4th ed.

Government Document Electronic Book
3
[University Park, Penn.] : [Harrisburg, Penn.] : Penn State Broadcasting ; PA Department of Environmental Protection, 2003

Government Document Electronic Book
4
[Harrisburg, Pa.] : Pennsylvania Department of Education, 1997

Government Document Electronic
5
Fredericksburg, Va. : U.S. Army Corps of Engineers, Mobile district with technical assistance from Marstel Day Conservation & Consulting, 2010

Government Document Electronic
6
[Washington, D.C.] : [Reston, Va.] : U.S. Fish and Wildlife Service ; U.S. Geological Survey, 1999

Government Document Electronic Book
7
University Park, Pa. : Pennsylvania Public Library Film & Video Center, 1998

Government Document Electronic Journal
8
[Harrisburg, PA] : Pennsylvania, Department of Transportation, 2005

Government Document Electronic Book
9
[Washington, D.C.] : U.S. Dept. of Energy, 1994

Government Document Electronic Serial
10
[Washington, D.C.] : U.S. Dept. of Agriculture, National Agricultural Statistics Service, 2009

Government Document Electronic Book
11
Middletown, PA : Pennsylvania State Data Center, 1999

Government Document Electronic Book
12
Washington, DC : Office of Toxic Substances, 1989

Government Document Electronic Journal
13
[Washington, DC] : U.S. Department of Housing & Urban Development, Office of Policy Development & Research, 1999

Government Document Electronic Book
14
Washington, D.C. : U.S. Patent & Trademark Office, OCIO, Information Products Division, 2001

Government Document Electronic Journal
15
Philadelphia, Pa. : Environmental Fund for Pennsylvania, 2000

Government Document Electronic Journal
16
[Washington, DC] : U.S. Dept. of Agriculture, Food Safety and Inspection Service, 2011

Government Document Electronic Book
17
University Park, PA : [Pennsylvania Department of Education], 1997

Government Document Electronic Book
18

Government Document Electronic Reference Material
19
[Harrisburg, Pa.] : Pennsylvania Governor's Center for Local Government Services, 2001

Government Document Electronic Book
20

Government Document Electronic Journal