I posted a few weeks ago about the checklist for National Geographic available at
A few people from this group have signed up to check off which issues they have there. With an enormous amount of help from Mel De Vilbiss, we have also created a checklist for the maps and supplements; you can see it (and use it) here:
The list is intended to include only those maps and supplements that were not bound into the magazines. There are many issues that have supplemental material that is bound into the magazine, usually as a foldout -- the December 2011 "Cats in Crisis" foldout is an example. I have excluded the ones I know to be foldouts, based on information provided by Mel De Vilbiss and Philip Riviere, but there may still be mistakes -- if so, they are my mistakes, not Mel's or Philip's.
I hope people here find these checklists useful. If you do spot errors, e.g. if I have listed a supplement that is bound in as a foldout and is not loose or lightly glued in, please let me know and I'll correct it. If there is interest, I could also create a list of all supplements, whether bound in or not.
Just to let you know , those two links lead to pages that say the pages no longer exist. Would have been nice to see.