Description
Item Description:One folded col. map in pocket.
Physical Description:vi, 36 pages : illustrations (some color) ; 28 cm.
Also available via Internet from USGS web site. Address as of 11/8/06: http://pubs.er.usgs.gov/usgspubs/b/b1713D; current access available via PURL.
Bibliography:Includes bibliographical references (pages 19-22).