Free image sources for the United States
Source	License	Tag
Wikimedia Commons (Cat:United States)	Various	N/A
Historic American Buildings Survey ([1])	P.D.	{{PD-USGov}}
Historic American Engineering Record ([2])	P.D.	{{PD-USGov}}
Historic American Landscapes Survey	P.D	{{PD-USGov}}
National Park Service ([3] and [4])	P.D.	{{PD-USGov-Interior-NPS}}
U.S. Coast Guard ([5])	P.D.	{{PD-USGov-DHS-CG}}
Library of Congress - American Memory ([6])	P.D.	{{LOC-image}}
Library of Congress - Prints and Photographs ([7])	P.D. (not all)	{{LOC-image}}
NOAA ([8])	P.D.	{{PD-USGov-DOC-NOAA}}
U.S. Fish and Wildlife Service ([9])	P.D.	{{PD-USGov}}
Creative Commons (by,sa) on Flickr ([10])	C.C.	{{cc-by-2.0}}{{cc-by-sa-2.0}}
U.S. Department of Agriculture ([11])	P.D.	{{PD-USGov}}

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