Transcript follows. Image supplied very kindly by D. Barrow.

Image: D. Barrow
Transcript
THE MACDONALD TREADMILL
Dear Editor:
Don't be upset about receiving this form letter!
We would like to write a personal letter to each and every one of you, but the great mass of stories submitted from this office makes such a procedure impractical. Surely you can understand that!
If by any chance we have been unable to use your magazine, don't be discouraged. It may not be due to any particular deficiency in the magazine, but instead to the fact that we haven't recently been writing the type of THING that you use.
Try again, won't you?
And, we beg of you - DON'T BE DISCOURAGED!
Affectionately,
John D. MacDonald
Fiction published by:
DOC SAVAGE
THE SHADOW
DIME DETECTIVE
DETECTIVE TALES
SHORT STORIES
ADVENTURE
BLUE BOOK
THE BOMBAY NEWS
THE DUBUQUE BUGLE
Also many minor publications such as Esquire, Story, The Elks and the Congressional Record.