DJ Back Style l Variations
At least five versions of this style gave been reported, starting in 1965. Styles with an ISBN number at the bottom date to a post-1970 printing.

l'  Fall 1965

 Full band at bottom
used with first printings of titles in binding 11

Style l   1965 - 1966

Used on books published in Fall 1965,
perhaps through 1966

Style l(b)      Early 1967 (?) - 1970
no address at bottom

Style l'a        post-1970
Short-term use

Style l'' post-1970