multiple times was still being amended as late as the 1970s amended Social Security Bulletin http://www.ssa.gov/policy/docs/ssb/v66n1/v66n1p1.html online version multiple times http://www.ssa.gov/policy/docs/ssb/v66n1/v66n1p1.html online version online version Social Security Bulletin online version Social Security Bulletin online version multiple times online version Social Security Bulletin Social Security Bulletin amended online version Social Security Bulletin amended amended online version amended online version online version amended amended online version was still being amended as late as the 1970s http://www.ssa.gov/policy/docs/ssb/v66n1/v66n1p1.html multiple times retrofitted Social Security amended amended amended amended online version amended multiple times http://www.ssa.gov/policy/docs/ssb/v66n1/v66n1p1.html significant and permanent increase amended Social Security Bulletin multiple times multiple times amended amended 1939 amendments online version amended amended online version online version multiple times multiple times amended online version online version amended amended amended amended http://www.ssa.gov/policy/docs/ssb/v66n1/v66n1p1.html