Member David Lindwall's article
got Guatemala? was published in
the March 2019 issue of
The American Philatelist. APS members
may read the article online here.
The March/April issue of Topical Time,
the journal of the Americal Topical
Association, contains two articles on
Mayan topics on stamps.
Dr. Andrew Cheung has graciously made available his 8 frame exhibit "Guatemala Airmail 1924-1945" for viewing.