[...] & I will ask you to pass it along—after as long a reading as you care to give it—to Robert E. Howard, Lock Box 313, Cross Plains, Texas. When many people want to see the same story, it is most convenient to start it circulating in this way.
— H. P. Lovecraft to R. H. Barlow, 17 Sep 1931 (OFF 8)
The two tales safely arrived, & I am glad the “Mts. of Madness” duly reached you. When you are entirely through with the latter, I would appreciate your sending it on to Robert E. Howard, Lock Box 313, Cross Plains, Texas.
— H. P. Lovecraft to R. H. Barlow, 25 Sep 1931 (OFF 10)
This morning I took out a big registered envelope with a “War Department” letter-head. I had visions of me shouldering a Springfield already, but it was from a gentleman named Barlow, at Fort Benning, Georgia, asking me for my autograph, for which purpose he enclosed a blank sheet of paper and a stamped self-addressed envelope. He also enclosed a 115 page ms. which he said Lovecraft had instructed him to forward me. It’s the Antarctic story which Farnsworth rejected, and which Lovecraft promised to let me read in the original.
— Robert E. Howard to Tevis Clyde Smith, Oct 1931 (CL2.273)
Which was followed shortly after by the first mention of Barlow in Howard’s letters: