Includes bibliographical references (pages 15-21).
Also available via Internet from the PNW web site (PDF file only). Address as of 6-8-00: http://www.fs.fed.us/pnw/pubs/gtr%5F443.pdf ; current access is available via PURL.
Microfiche. [Washington, D.C.] : Supt. of Docs., U.S. G.P.O., 1999. 1 microfiche : negative.