Just for historical reference and comparison's sake, here's are just some of the DC issues published in Sept '64, according to "Mike's Amazing World" and Denys Howard's "DC Archives Stories Listed by Pub Date".

Archived:

Batman 167
Batman (Detective 333)
Justice League of America 31
Legion of Super-Heroes (Adventure 326)
Doom Patrol 91

Unavailable in color collected editions?

Superman 173
Superman (Action 318)
World's Finest 145
Flash 148
Wonder Woman 150
Aquaman 118
Superboy (Adventure 326)
Supergirl (Action 318)
Elongated Man (Det 333)
Adam Strange (Mystery in Space 95)
Blackhawk 202
Lois Lane 53
Sgt. Rock (Our Army at War 148)
Rip Hunter, Time Master 23


"Now we're getting off focus." - the Elder Son of Storytime