I listed on my web all National Geographic magazines dealing with astronomy and astronautics since 1928 but 'd like to extend it to the beginning, by 1890. Currently I have gathered ~100 issues (they are probably some more) so in average there is about one issue per year (less in the past than nowadays).
The page displays each cover with the date, vol and number of the magazine, the subject and as far as possible a screenshot of the map or poster if it includes one.
In addition links are provided to bookshop selling back issues.
The page is written in French but as an image is worth thousand words in all langages, I think that the the page is self explanatory ;-)
Hope this help