Hardy Boys Edition Identifier: The Secret Of The Old Mill

#	Years	Text	Cover	Spine	Art	EPs
A	1927-32	Original	Red	White	Rogers	Blank
B	1932		Brown			Brown Gretta
C	1932-40					Orange Gretta
E	1941-43			Yellow
F	1944-50				Scott
G	1951-59		Tan
I	1959					Brown multi scene
J	1959-61			Wrap	Nappi
K	1962		PC	Blue
L	1962-71	Revised				White multi scene
M	1971-79
N	1979-87					Cameo
O	1987-Date		Flashlight PC			Blank
P	2016		New Art	Black	Jonathan Bartlett
Major Variants 1962 - "$1 Box" on both original & revised text PC's 1973 - red page tops