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Revised May 1977.
Revised April 1983. Reviewed July 2014. Facts and recommendations in this publication may no longer be valid. Please look for up-to-date information in the OSU Extension Catalog:...
Revised March 1982. Reviewed July 2014. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog
Revised March 1985. Reprinted January 2000. Please check for active titles in the OSU Extension Service Catalog: http://extension.oregonstate.edu/catalog
Published 1975. Revised February 1978.