20 CFR 404.141 : Employees' Benefits (§ 1.1 To Parts 1011-1099) — (Part 400 To Part 499) — Social Security Administration (Part 400 To Part 499) — Federal Old-Age, Survivors And Disability Insurance (1950- ) (§ 404.1 To § 404.2127) — Insured Status And Quarters Of Coverage (§ 404.101 To Appendix To Subpart B Of Part 404) — Quarters Of Coverage (§ 404.140 To § 404.146) — How we credit quarters of coverage for calendar years before 1978.