In a letter (#301) to August Derleth, ca. mid-October 1934:

My latest sales have been a 23,000 word Oriental adventure yarn to Top- Notch, and a two-part Conan serial to Weird Tales; no sex in the latter. I wanted to see if I could write an interesting Conan yarn without sex interest.

The Top-Notch story is possibly “The Daughter of Erlik Khan,” but more likely “Hawk of the Hills” or “Blood of the Gods.”

The story is also mentioned in a letter (#304) to H.P. Lovecraft, ca. December 1934:

My latest sales to Weird Tales have been a two-part Conan serial: “Beyond the Black River” — a frontier story; and a novelet dealing with Mississippi negroes, etc. “The Moon of Zambebwei”, which I understand will be changed to “The Grisly Horror.”

The Californian Magazine was a fan magazine published by Hyman Bradofsky. In a letter (#352) in Summer 1936 to this magazine Howard writes:

Thank you very much for the copy of The Californian. I feel greatly honored that Miss Wooley should have quoted an excerpt from my serial “Beyond the Black River” in her article in your fine journal.

The story was "The Adventure Story" by Natalie Wooley, Fall 1935.