Hi - I found this in Folk Music - An Index to Recorded Resources, another service of the Milton Eisenhower Library at Johns Hopkins University.

If I read it correctly, maybe the index attributes the song to Harry McClintock, who wrote "Big Rock Candy Mountain." Dick Greenhaus, you know about these things - did McClintock write "Bum"?? I found the song in the Silverman "Folk Song Encyclopedia," with no songwriter named.

The Great American Bum - McClintock, Harry "Haywire Mac"
Recordings:
Greenway, John. Big Rock Candy Mountain. Songs of the American Hobo & Migrato.., Washington WLP 710, LP (195?), cut#A.01
Holstein, Fred. Chicago and Other Ports, Philo 1030, LP (1977), B.02b