Given that the battle between Superman and Wonder Woman took place during World War II and that it involved Hitler and the Spear of Destiny, I have to guess that this story took place on Earth-2.
Summaries available here
http://www.supermantv.net/articles/wonderwoman.htmand here
http://www.amazon-archives.com/smvsww.htmI gotta wonder - was this the first appearance of Albert Einstein in a Superman comic?
Superman vs Mohamed Alì and vs Spiderman and Shazam is earth-1.
At the time, Spiderman was an inhabitant of the Marvel Universe and Captain Marvel lived on Earth-S. I haven't read the Shazam issue, but I seem to recall that in the Superman/Spiderman crossover, there was no mention of alternate earths - Superman's Metropolis and Spidey's NYC just both existed on Earth.