Proceedings of the U.S. Geological Survey Global Change Research Forum, Herndon, Virginia, March 18-20, 1991 /
U.S. Geological Survey Global Change Research Forum(1991 :Herndon, Virginia)
Kelmelis, John A.
Snow, Mitchell.
Geological Survey (U.S.)
[Washington, DC] : USGPO,
1993.
Includes bibliographical references and index.