Description
Item Description:Title from title screen (viewed July 1, 2009).
"Funded by the National Park Service under contract number CX702970013 with Soil Systems, Inc., Phoenix, Arizona"--P. xiii.
Electronic resource.
Physical Description:xiii, 313 pages : illustrations, maps
Format:Mode of access: Internet from the NPS web site. Address as of 07/01/09: http://www.nps.gov/archive/azru/adhi/adhi.htm ; current access is available via PURL.
Bibliography:Includes bibliographical references (pages 251-261).