This is one of four reports that present the concepts, procedures, information, and 

 analyses developed in the Forest-Range Environmental Study (FRES), Forest Service, 

 U.S. Department of Agriculture, 1970-1972. 



The basic document is: 



• The Nation's Range Resources — a Forest-Range Environmental Study. This report 

 presents basic concepts and methods, information on supply and demand for re- 

 sources from all the Nation's forest-range environment, and analyses of alterna- 

 tive mixtures of resource use. 



Supporting The Nation's Range Resources — a Forest-Range Environmental Study are : 



• Forest-Range Environmental Production Analytical System (FREPAS), the ana- 

 lytical and computer capability developed for FRES. 



• Vegetation and Environmental Features of Forest and Range Ecosystems, a sys- 

 tem of classifying all the land area of the 48 contiguous States into 34 units called 

 "ecosystems," and a description of each. 



• Range Management Practices: Investment Costs, 1970. Definitions of the 18 range 

 management practices used in the Forest-Range Environmental Study (FRES) and 

 lists of investment costs for each practice in each of 956 resource units of forest- 

 range found within 34 major ecosystems. 



For copies write to the U.S. Department of Agriculture, Forest Service, Washington, 

 D.C. 20250. 



/vNAO 



The cover design symbolizes the interrelationship 

 of organisms and their environment and the sun 

 — the moving force without which life could not 

 exist. Plants and animals all work together within 

 an ecological system, an ecosystem. 



