DC 100 Page Super Spectacular (1975) #115 World's Finest #228 VF+ (8.5) DC-115

DC 100 Page Super Spectacular (1975) #115
World's Finest #228
VF+ (8.5)
DC-115

I've been on a real tear lately, scooping up all the 100 page DC specials that came out, and could use some input.

IIRC, circa 1970 DC released a run of these so-called 100 page Super Specials that ran though their entire colony of books, or at least the big sellers. They repeated this in 1975 with a similar program, Super Specials or something to that effect.

To my knowledge, they did this twice and ONLY twice, but I could be mistaken. The input I need is a list of all the books (and corresponding issues if I can tread this request further) that fell under this PR stunt, which seems to be working on me at least 35 years later.

The attraction is the backup stories are often culled from DC issues from the 40s and 50s, a real gold mine of Americana. But also, the core stories represented some of DCs best work at the time.

1970 had Detective Comics and I presume Batman, and ?
1975 had House of Mystery/Secrets, Tarzan, Ghosts, and ?

I could guess that Superman, Flash, Brave and Bold and World's Finest are in the running, but it's a real pain trying to sort this all out, so if anyone has any leads?