British Butterfly Conservation Society Ltd., P.O. Box 222, Dedham, Colchester, Essex CO7 6EY, Great Britain. 9301 Annapolis Road, Lanham, MD 20706. Monarch Program, P.O. Box 178671, San Diego, CA 92177.
Quarterly newsletter includes sources for milkweed.
Monarch Watch, Dept. of Entomology, Univ. of Kansas, Lawrence, KS 66045. Mt. Magazine International Butterfly Festival. La Crosse Avenue, Austin, TX 78739. Leesburg Pike, Vienna, VA 22184-0001. Two quarterly publications.