Yes, Scull and Hammond's Chronology relates that on August 28, 1969, Tolkien mailed Pauline Baynes a copy of the LoTR map (that she had previously provided) with added annotations and corrections. The annotated version was provided in connection with her preparation of the "poster map" (Unwin's term). This, I assume, is the map shown in your link. JRRT first began corresponding with Baynes in 1949 when she was illustrating Farmer Giles.
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Beleriand, Beleriand,
the borders of the Elven-land.
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