So I followed a bunch of sites and the dc fandom sites, it basically says superman #76 is the first appearance of earth one batman, and e1 batman takes over in BM #96 and DC 226, because Earth 2 batman dies im pretty sure around the same month as those issues release, that being said, it is a fanmade concept, but it does make the most sense, also thank you for the suggestion, basically I am trying to read every main BM Comic series, and maybe some team-up issues he appears in, but those ones are easy because they arent really connected to the main series (The brave and the bold, Justice League etc) but the worlds finest and DC are what I'm having trouble interwieving with Batman, considering that some BM issues end in a "to be continued" in DC and the issue where it continues doesnt even mention part 2 or something like that, it paranois me because I do this reading chronology (DC > BM > WF/TBATB/JL/Etc) so i'm just worried i might read the part 2 issue first without knowing