AG Was Great because of Chris
I had the good fortune to publish an article in Ag in 2012 (Full Circle Apollo: Larry Fink Goes Digital at the Met) and Chris Dickie was one terrific guy to work with. AG was a very high-quality international journal because of Chris's careful attention to every detail and the breadth of his photographic knowledge. I haven't seen any publications that are filling the void left by AG, though I'm hopeful someone else out there has the dedication plus the depth of knowledge it will take to provide the quality of looking and reading that AG did.
If you have the opportunity to hunt down any issues, I think the search is worth it.