There are quite a few great web sites devoted to Edgar Rice Burroughs, "The Master of Adventure." The best are filled with artwork, photos and information galore. Have a great time exploring and maybe even join the Burroughs Bibliophiles, the oldest existing ERB fan club.
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Edgar Rice Burroughs Incorporated — The official Edgar Rice Burroughs, Incorporated website. You can find the address of the ERB, Inc. offices here along with information about the various characters and series', details about all the Tarzan movies as well as new comic strips about Tarzan, Carson Napier of Venus and many other adaptations of Burroughs' books.
The Burroughs Bibliophiles — The longest-running ERB fan organization. Here's where you can download a form to join the club and find back issues of the Burroughs Bulletin.
The Hillman's ERBzine — Bill and Sue-on Hillman have more Burroughs sites than you can shake an assagai at. You'll spend HOURS here! Hard not to get lost in the welter of links though.