Edgar Rice Burroughs (Wikipedia)
Stanford search engine comes up with 1,834 renewals for ERB. However, it seems like some of the early work may have been missed.
- Skeleton Men of Venus [Error in TOC. Jupiter, actually] - ERB - Reprint - NR in '63, check paper. Renewed: The skeleton men of Jupiter. (In Amazing stories, Feb. 1943) - 10Dec42; B567974. R477061.
At the Earth’s Core - 1922 - pre-1923
Pellucidar - 1923 (/1915 periodical publication) - in Gutenberg
Tanar of Pellucidar - 1930 - tenatively not found; magazine renewal not searched (1929 publication in the Blue Book Magazine)
Tarzan at the Earth’s Core - 1930 - tenatively not found; magazine renewal not searched (1929-1930 publication in the Blue Book Magazine)
Back to the Stone Age - 1937 - R345914
Land of Terror - 1944 - R506358
Savage Pellucidar - 1963 - RE570902