Online-Ressource
[Reston, Va.] :U.S. Dept. of the Interior, U.S. Geological Survey,
UID:
edocfu_9961073759902883
Umfang:
4 unnumbered pages :
,
digital, PDF file.
Serie:
Fact sheet ; 051-00
Anmerkung:
Title from title screen (viewed on Aug. 29, 2008).
,
"April 2000."
,
Mode of access: Internet from the USGS web site. Address as of 8/29/08: http://pubs.usgs.gov/fs/fs-051-00/pdf/fs-051-00.pdf; current access available via PURL.
Sprache:
Englisch
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