Volume 20 - The Mystery Of The Flying Express - Major Edition Types
Hardy Boys Cover Art Hardy Boys Cover Art Hardy Boys Cover Art
#YearsTextCoverSpineArtEPs
A1941-50OriginalBrownYellowLauneOrange Gretta
B1951-58 Tan   
C1959-61    Brown multi scene
D1962-69 PCBlueLeone 
E1970-79revised  NappiWhite multi scene
F1979-87    Cameo
G1987-Date Flashlight PC  Blank
Major Variants
1959 - off-center cut, dark brown multi scene endpapers

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