Click on the links below to view the Circulars
- 12-01 W.R. Grace and Company Special Exposure Cohort (SEC) Class from May 1, 1956 through January 31, 1958
- 12-02 Y-12 facility Special Exposure Cohort (SEC) Class from January 1, 1948 through December 31, 1957
- 12-03 Ames Laboratory at Iowa State University Special Exposure Cohort (SEC) Class from August 13, 1942 through December 31, 1970
- 12-04 Vitro Manufacturing Special Exposure Cohort (SEC) Class from January 1, 1960 through September 30, 1965
- 12-05 Employment at 17 new facilities now covered under EEOICPA and additional years added at 3 facilities
- 12-06 Pantex Plant Special Exposure Cohort (SEC) Class from January 1, 1958 through December 31, 1983
- 12-07 Linde Ceramics Plant Special Exposure Cohort (SEC) Class from November 1, 1947 through December 31, 1953
- 12-08 Savannah River Site Special Exposure Cohort (SEC) Class from January 1, 1953 through September 30, 1972
- 12-09 Electro Metallurgical Special Exposure Cohort Class (SEC) from August 13, 1942 through December 31, 1947
- 12-10 Sandia National Laboratories Special Exposure Cohort Class (SEC) from January 1, 1963 through December 31, 1994
- 12-11 Clinton Engineer Works Special Exposure Cohort Class (SEC) from January 1, 1943 through December 31, 1949
- 12-12 Brookhaven National Laboratory Special Exposure Cohort Class (SEC) from January 1, 1980 through December 31, 1993
- 12-14 The Feed Material Production Center (FMPC) Special Exposure Cohort Class (SEC) from January 1, 1968 through December 31, 1978
- 12-15 Winchester Engineering and Analytical Center Special Exposure Cohort Class (SEC) from January 1, 1952 through December 31, 1961
- 12-16 Hanford Engineer Works Special Exposure Cohort Class (SEC) from July 1, 1972 through December 31, 1983
- 12-17 Clarksville Modification Center, Ft. Campbell Special Exposure Cohort Class (SEC) from August 1, 1949 through December 31, 1967
- 12-18 Medina Modification Center Special Exposure Cohort Class (SEC) from January 1, 1958 through December 31, 1966