4TH INTL CONFERENCE OF MEDICHEM; ACGIH, AMERICAN CONFERENCE OF GOVERNMENTAL INDUSTRIAL HYGIENISTS; CANTOX; CHLORINE INST; ECETOC TASK FORCE; EEC, EUROPEAN ECONOMIC COMMUNITY; FDA, FOOD AND DRUG ADMINISTRATION; GOODRICH; HSE; ICI; INTL CENTER FOR A SCIENTIFIC ECOLOGY; INTL SCIENTIFIC SEMINAR; MONTEDISON; OSHA, OCCUPATIONAL SAFETY & HEALTH ADMINISTRATION; RHONE POULENC;