I didn’t get that link to work.
This might be interesting, it was to us:
https://www.treasurydirect.gov/indiv/research/indepth/ebonds/res_e_bonds_eeratesandterms_eebondsissuedbefore051995.htm#now
as well as this:
https://www.treasurydirect.gov/indiv/planning/plan_education.htm
(I’m hoping to use some of mine for my son)