I have a book (Hardcover, "Hitler's Wartime Picture Magazine: Signal", edited by S.L. Mayer, 1976 ISBN 0 13 810051 9.
It is a fantastic book to own if you have any interest in Signal Magazine. It is basically an English compilation of atricles as they appeared in the magazine throughout it's run, even the headline and insert text is translated in original fonts, etc. and includes photos and layout exactly as it appeared in the magazine.
It is just full of color and B&W fantastic and famous photos, and the propaganda of the times as it read in Signal - complete with period advertisements.
Jeff