Notes:

1. This is a rough guide to spine formats. If you want to get technical, I suggest Hardy and Hardy Investigations.
2. "B" refers to the first printings of said books with the spine. For formats YS2 through some of WS3, all books.
3. went through brown printings and tweed printings using the jacket.

Although Wrap Spines 3 and 4 appear alike, 3's Hardy Boys Series is transparent, while 4's is blacked in.

Spine Type:	White Spine	Yellow Spine 1	Yellow Spine 2	Wrap Spine 1	Wrap Spine 2	Wrap Spine 3
Spine Picture:
Used on:	First twelve volumes 1-11R,B 12B	First 17 Volumes All B (first art DJs)	1-9B (second art) 18-24B	Used for WHAM,B (HB box is like YSDJs)	Used 25-28B (New HB Series Box)	29, 30B | 32, 33T 11-15T Second Art
Spine Type:	Wrap Spine 4	Blue Spine	Tan Spine	"Flashlight"
Spine Picture:
Used on:	1-9 T(third art) 31, 34-40T	All picture covers; (1962 till 1987)	Newer Detective Handbooks (Newest have  bottom info in a  white box.)	All new editions (from 1987 to now)