A new map of standardized terrestrial ecosystems of the conterminous United States / 
By Roger Sayre ... [et al.]. 
 - Reston, Va. :  U.S. Dept. of the Interior, U.S. Geological Survey,  2009. 
 - iv, 17 p. :  col. ill., maps ;  22 cm. 
 - U. S. Geological Survey Professional paper  No. 1768 .
 - U. S. Geological Survey Professional paper  No. 1768 .
<br/><br/>Includes bibliogr. references :(p. 14-17). 
<br/><br/><label>ISBN: </label>
<br/><br/><label>Subjects--Topical Terms: </label><br/>Biotic communities--United States<br/>Ecosystem management--United States