Preliminary geologic map of the northwestern part of the Alamosa 30 X 60 minute quadrangle, Alamosa and Conejos Counties, Colorado [electronic resource] / by Michael N. Machette and Ren A. Thompson ; U.S. Department of the Interior, U.S. Geological Survey.
Mode of access: Internet from the USGS web site. Address as of 4/28/06: http://pubs.usgs.gov/of/2005/1392/pdf/1392.pdf; current access via PURL.
System requirements: PC with internet access and ability to handle pdf (Portable Document Format) files for viewing the map; for GIS access, ability to handle ARC/INFO coverages in ARC export and ARCVIEW shapefile; for metadata access, ability to read common ASCII format text files.
Title from HTML index page (viewed on Feb. 27, 2006).