ADVISORY COMM ON ASBESTOS CANCERS; HOMESTAKE; HOMESTAKE VETERANS CLUB; INTL AGENCY FOR RESEARCH ON CANCER; INTL UNION AGAINST CANCER; NATL BUREAU OF STANDARDS; NIOSH, NATL INST FOR OCCUPATIONAL SAFETY & HEALTH; PUBLIC HEALTH SERVICE; UICC; VETERANS ASSOC; WORKING GROUP ON ASBESTOS + CANCER; WORKSHOP ON ASBESTOS