In 1964, we reported data concerning the mortality experience of a cohort of asbestos insulation workers in the New York-New Jersey metropolitan area 1943-1962.’Significant increases in deaths of lung cancer, mesothelioma, gastrointestinal cancer and asbestosis were found. Findings were limited to observation of only 632 men, however. On January 1, 1967, a larger cohort was enrolled for prospective observation and included all 17,800 men on the rolls of the insulation workers’ union (International Association of Heat and Frost Insulators and Asbestos Workers, AFL-CIO, CLC) in the United States and Canada on that day. This second cohort included the survivors of the original 632 New York-New Jersey men. Observation has been maintained and an interval report of deaths in this group since January 1, 1967 has been made.* The present analysis details findings among these men through