Online Resource
Reston, Va. :U.S. Dept. of the Interior, U.S. Geological Survey,
UID:
edoccha_9961079977402883
Format:
vii, 65 pages :
,
digital, PDF file.
Series Statement:
Circular ; 1331
Note:
Title from title screen (as viewed on Feb. 18, 2009)
,
Mode of access: Internet from the USGS web site. Address as of 5/8/09: http://pubs.usgs.gov/circ/1331/Circ1331.pdf; current access available via PURL.
Language:
English
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