| Issue | #834 |
| Published | September 1957 |
| Cover Price | 0.10 USD |
| Pages | 36 |
| Editing | ? |
| Notes | Indicia title is "JOHNNY MACK BROWN, No. 834." Code number is J.M.B.O.S. #834-579. Copyright 1957 by Johnny Mack Brown. Eleventh of thirteen Johnny Mack Brown Four Color issues. |
| Characters | Johnny Mack Brown (photo) |
| Genre | western |
| Pencils | ? (photo) |
| Inks | ? (photo) |
| Colors | ? (photo) |
| Letters | typeset |
| Characters | Buffalo Bill Cody (cameo) |
| Synopsis | Description of the operations of the Pony Express. |
| Genre | fact; western |
| Letters | typeset |
| Notes | Inside front cover; black and white; Craftint shading. Panels with typeset text underneath. |
| Characters | Johnny Mack Brown; Rebel (horse) |
| Synopsis | Johnny comes to a town where a man is on trial for ambushing a ranch foreman and stealing $10,000. The foreman identifies the man as the one who shot him, but the case has to be dismissed when the defendant's twin brother comes to the courtroom and the foreman can't tell them apart. Johnny has to investigate to find the guilty man. |
| Genre | western |
| Pencils | Dan Spiegle ? |
| Inks | Dan Spiegle ? |
| Characters | Johnny Mack Brown; Rebel (horse) |
| Synopsis | Johnny has to stop train robbers who plan to wreck a train, steal a gold shipment, and escape on a railroad handcar. |
| Genre | western |
| Pencils | Bill Ziegler |
| Inks | Bill Ziegler |
| Synopsis | Facts about cowboy's chaps. |
| Genre | fact; western |
| Letters | typeset |
| Notes | Inside back cover; black and white; Craftint shading. Panels with typeset text underneath. |
| Synopsis | A wealthy rancher builds a stone corral for his horses, but renegade Indians find a way to steal them anyway. |
| Genre | western |
| Letters | typeset |
| Notes | Back cover; monochrome colored panels with typeset text underneath. |