Includes bibliographical references (pages 21-24).
Also available via Internet from the ERS Web site (PDF file). Address as of 3-25-02: http://www.ers.usda.gov/publications/aib770/aib770.pdf; current access is available via PURL.
Microfiche. [Washington, D.C.] : Supt. of Docs., U.S. G.P.O., 2002 1 microfiche : negative.