Includes bibliographical references (pages 15-19).
Also available via Internet from the ERS Web site (PDF file). Address as of 10-12-01: http://www.ers.usda.gov/publications/aib772/aib772.pdf; current access is available via PURL.
Microfiche. [Washington, D.C.] : Supt. of Docs., U.S. G.P.O., 2001 1 microfiche : negative.