Descripción
Notas:"This study was supported by the Bureau of Land Management, Department of the Interior, under assistance award No. 1434-HQ-97-AG-01886"--Title page verso
Descripción Física:1 online resource (xi, 247 pages)
Bibliografía:Includes bibliographical references (pages 125-132).
ISBN:0585126291
9780585126296
0309172667
9780309172660
9786610210299
6610210292
0309562104
9780309562102