A new map of standardized terrestrial ecosystems of the conterminous United States /
Sayre, Roger.
United States.Department of the Interior.
Geological Survey (U.S.)
Reston, Va. : U.S. Geological Survey,
2009.
Includes bibliographical references (p. 14-17).
Biotic communities
Biotic communities
New map of standardized terrestrial ecosystems of the conterminous United States