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Research & Analysis by Irwin Wolkstein
Elective Coverage Under Old-Age, Survivors, and Disability Insurance
from Social Security Bulletin, Vol. 20, No. 5 (released May 1957)
Railroad Retirement and Old-Age and Survivors Insurance Work-History Records, 1937–50
from Social Security Bulletin, Vol. 16, No. 4 (released April 1953)