Descripción
Notas:"Support for this project was provided by the U.S. Geological Survey under Contract No. 98HQAG2028"--Title page verso.
Descripción Física:1 online resource (xiv, 143 pages) : illustrations
Bibliografía:Includes bibliographical references (pages 116-132).
ISBN:0309569761
9780309569767
0309171571
9780309171571
1280185309
9781280185304
9786610185306
6610185301