The national map-- orthoimagery layer.

Bibliographic Details
Corporate Author:	Geological Survey (U.S.)
Format:	Government Document eBook
Language:	English
Published:	[Washington, D.C.?] : U.S. Dept. of the Interior, U.S. Geological Survey, [2007]
Series:	Fact sheet (Geological Survey (U.S.)) ; 2007-3008.
Subjects:	Orthophotography > United States. Digital mapping.
Online Access:	https://purl.fdlp.gov/GPO/LPS105559

Description
Item Description:	Title from title screen (viewed on Nov. 19, 2007). "January 2007." Electronic resource.
Physical Description:	2 unnumbered pages : digital, PDF file.
Format:	Mode of access: Internet from the U.S. Geological Survey website. Address as of 10/30/2008: http://egsc.usgs.gov/isb/pubs/factsheets/fs20073008/fs20073008.pdf ; current access is available via PURL.