I have re-checked my previous 1927 attribution to Ramos- "Alla en El Rancho Grande" was copyright in 1927 by Edward B. Marks Music Corp. for Silvano R. Ramos (words and music).
Took a while to find that this is correct (it is cited in Lomax and Lomax, 1934, "American ballads and Folk Songs, p. 361-361, but I don't trust their citations).
In 1936, Bartley Costello and Silvano R. Ramos published the version sung by Gene Autry (1940) and so many others.
In 1936, it was used in the Mexican film of he same name; Ramos is credited.

The Texas Folklore Society article by Moros is dated 1931; I still find it odd that the editors were unaware of the 1927 copyright.