Ideally, each publication would have archives of its magazines available online as PDFs (even limiting it to subscribers or pay for access would be ok) or some BB federation would offer PDF archives of old/defunct magazines. That this hasn’t happened underscores how disorganized this sport is.
none of the existing mags have their original owners, and when they bought the mags, they generally didn't buy the rights to the back issues. In addition, copyright law regarding magazines changed in 1975. Prior to that, mags were in the public domain the day they hit the newsstand. (In the 1940s Weider was notorious for reprinting articles from European mags in Your Physique and Muscle Power, without compensation to the original mag or author.) For mags after 1975, someone still owns the copyright, but figuring out who is pretty much impossible.
Tim, you’ve done a big service to BB fans schmoes everywhere!
Thanks. I've had so many more plans for musclememory, such as finishing the searchable database of magazine
table of contents (only have gotten up to the mid 1970s) but both time and money is in short supply.
But will musclememory.com continue if you fall of a cliff or get crushed in bearhug with a pro bodybuilder? 
I've designated who gets what, but what they'll do with it is up to them.
BTW, IFBB pro bodybuilders are so last millennium. Now its UFC pros.