16 leaves, 1 folded leaf of plates : illustrations, map ; 28 cm
OCLC
ocm41288768
Includes bibliographical references (leaves 12-13).
Also available via Internet from the USGS web site. Address as of 11/12/09: http://pubs.usgs.gov/of/1998/ofr-98-239/ofr-98-239.html, http://pubs.usgs.gov/of; current access is available via PURL.