to see a bunch of 1970s Batsfords (and others) books.
These are are duplicates.
Particularly noteworthy are :
Think Like a Grandmaster
Complete Chess Strategy 1 : Planning the Pieces
Complete Chess Strategy 2 : Pawn-Play and the Centre
The Classical Dutch
The French Defence Main Line Winawer
The Pirc Defence
Comprehensive Chess Endings : Volume 2 (published by Robert Maxwell before his holiday)
and some other stuff such as American versions of the Pachman series.
I'm also getting rid of early Informators, Chess Players, New Chess Players, Modern Chess Theory etc.