I put "Brown's Ferry Blues" (minus quotation marks) into the Mudcat search box and got nearly 30 threads about that song or about the Delmore Brothers.

One phrase I found said "It was written by Alton Delmore in 1930, though not recorded until December 6, 1933. ...from the notes to The Delmore Brothers, Brown's Ferry Blues, County CD 116, 1995."

The post-war boogie woogie sound led to another recording of the song in FEB 1946. "Freight Train Boogie" was also recorded in FEB 1946 but at a different day and place, Kenneth "Jethro" Burns is credited with the electric guitar break.

All 20 songs on the CD I have date from JAN 1946 to MAY 1952 and are from King singles, #527 up to #1084.