Hardy Boys Edition Identifier: What Happened At Midnight

#	Years	Text	Cover	Spine	Art	EPs
A	1931-32	Original	Red	White	Rogers	Blank
B	1932-40		Brown			Orange Gretta
C	1941-45			Yellow
D	1946-50			Wrap	Laune (?)
E	1951-59		Tan
F	1959					Brown multi scene
G	1960-62
H	1962-66		PC	Blue
I	1967-71	Revised			Nappi	White multi scene
J	1971-79
K	1979-87					Cameo
L	1987-Date		Flashlight PC			Blank
Major Variants 1945 - Scott frontispiece/Rogers cover