Published January 1978. A more recent revision exists. Please look for up-to-date information in the OSU Extension Catalog: https://catalog.extension.oregonstate.edu
Published March 1993. A more recent revision exists. Please look for up-to-date information in the OSU Extension Catalog: https://catalog.extension.oregonstate.edu
Published January 1988. A more recent revision exists. Please look for up-to-date information in the OSU Extension Catalog: http://extension.oregonstate.edu/catalog