I thought this Sunday page was extremely interesting. In this page, Tarzan returns to the jungle and most of the frames provide some small insight into the elements of the environment he missed. The page also introduced "Ke-Lak," the leader of the Apes, that played a pivotal role for much of Moriera's tenure doing Tarzan.
Rubimor's 1946 Sunday "Tarzan" Page
Here's some additional background from Lambiek.com:
Rubimor: (Ruben Moreira) (6/27/1922 - 5/21/1984, Puerto Rico) Ruben Moreira moved from his native Puerto Rico to the USA. Here, he took over the 'Tarzan' Sunday page from Burne Hogarth. He drew the strip from 1945 to 1947 under the pseudonym "Rubimor." His style was less spectacular then Hogarth's, yet his storytelling had a resemblance to the writing of Tarzan's creator, Edgar Rice Burroughs. In the 1950s he drew for DC Comics, working on titles such as 'Wonder Woman' and 'Roy Raymond'. He retired from comics in 1962 and returned to Puerto Rico.
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From “Tarzan: Return to the Apes” by Edgar Rice Burroughs & Ruben Moriera (1946). Original artwork for Tarzan Sunday page by Ruben Moriera (or Moreira) and signed “Rubimor.” 1946, United Features Syndicate, pen and ink with brush on heavy paper, for the Sunday page dated 3/3/46; with slight dust soiling, some chips in outside margins, otherwise in good condition. NOTE: "Copr 1946, Edgar Rice Burroughs, Inc. Distr. by United Features Syndicate, Inc."; A "Vandercook" sticker. [Item: 19.75"W x 26.5"H] Acquired 2000. SeqID-0698 Updated: 7/31/2005