In Focus (ISSN 1534-8334) is published by the National Academies. Subscription (three issues): $10; Canada and foreign, $12 (U.S. currency only). Subscription address: In Focus, P.O. Box 8009, Aston, PA 19014. U.S. postage is paid at Washington, D.C. Back issues and back volumes can be ordered in microform from National Archive Publishing Company, 300 North Zeeb Road, Ann Arbor, MI 48103.