82 pages : illustrations (some color), color maps ; 28 cm
ISBNs
9780607922967, 0607922966
OCLC
on995470000002356284, ocm41942131, ocm41131767
Includes bibliographical references (pages 80-82).
Also available via Internet from the USGS web site (PDF file only). Address as of 7/27/99: http://water.usgs.gov/pubs/circ/circ1225/; current access is available via PURL.