https://www.google.com/search?q=galveston+plan&rlz=1C1GGLS_enUS359US359&oq=galveston+plan&aqs=chrome..69i57j0l7.6743j0j7&sourceid=chrome&ie=UTF-8
Disregard post #3...This is the correct site:
https://www.ssa.gov/policy/docs/ssb/v62n1/v62n1p47.pdf