Volume 13 - The Mark On The Door - Major Format Types
Hardy Boys Cover Art Hardy Boys Cover Art Hardy Boys Cover Art
A1934-46OriginalBrownYellowGrettaOrange Gretta
B1947-49   * 
C1950  WrapGillies 
D1951-58 Tan   
E1959-61    Brown multi scene
F1962-66 PCBlue    
G1967-79Revised NappiWhite multi scene 
H1979-87    Cameo
I1987-Date Flashlight PC  Blank
Major Variants
In 1970 & 1971 revised text editions were issued with the Gillies cover art.

* - frontispiece removed c.1947

All Editions For Sale