Before the internet, or even The Baseball Encyclopedia, stats for previous seasons often were in the form of baseball guides, often from The Sporting News.
Also in there, however, were more strange things. Some of them, for example, had a listing of where the visiting teams stayed. Now, even today you can often figure out where visiting teams stay in town due to ads that might say “Official Hotel of the Boston Red Sox” or something similar, to the point where most baseball players have aliases that they check in with that don’t reveal their fame (although Rickey Henderson, ever the master of disguise, went by the alias of “Richard Pryor”)
Anyway, if you are caught in a time warp and find yourself in the early 40s and want to visit some players, you can find them here, from the 1943 edition of the Baseball Guide and Record Book (found for free on archive.org):

Some things were better before :).