There are 37 official ATC map sheets. The article lists the map titles and latest revision dates.

Your article is something that's long been needed. Now if only people will link it, we'll be well on our way toward something better.

It's no secret I like articles. More people should take the time to write them.

You might add or link to your article a list of the most convenient places to send and/or return maps since it's a closely related question.

Thanks for taking the time to compile this list. As a repeat section hiker I like to know if my old maps are outdated, and time to buy a new one.