A vegetation database for the Colorado River ecosystem from Glen Canyon Dam to the western boundary of Grand Canyon National Park, Arizona / by Barbara E. Ralston [and others] ; in cooperation with Pinnacle Mapping Technologies, Inc. and Northern Arizona University.
Mode of access: Internet via the USGS web site. Address as of 07/11/08: http://pubs.usgs.gov/of/2008/1216/of2008-1216.pdf; current access available via PURL.
Note
Title from PDF title screen (viewed on July 9, 2008).
At head of title on HTML title screen: Southwest Biological Science Center.