Hebron's "Golf Mind, Golf Body, Golf Swing" is a worthy addition to any collection. An excellent survey of golf teaching over the years with a great presentation of TGM concepts. The photos alone are worth the book.
More of my personal favorites....
"The Golfing Machine" - Kelley
"5 Lessons - the modern fundamentals" - Hogan
"How to Feel a Real Golf Swing" - Toski/Love
"Golf My Way" - Nicklaus
"Play Golf the Wright Way" - Wright
"Shape your swing the modern way" - Nelson
"Stop that Slice" - Dante
"On Learning Golf" - Percy Boomer
"The Natural Golf Swing" - Knudson
"The Elements of Scoring" - Floyd
"Golf Myths Exposed" - Hall
"The Swing" - Price
"A New Way to Better Golf" - Morrison
"Swing the Clubhead" - Ernest Jones
"Extraordinary Golf" - Shoemaker
"Zen Golf" - Parent
And from a course management standpoint, everything Jack ever did is full of gems. Wright's book is subtle in its presentation, but outstanding in content.
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"Support the On Plane Swinging Force in Balance"
"we have no friends, we have no enemies, we have only teachers"
Simplicity buffs, see 5-0, 1-L, 2-0 A and B 10-2-B, 4-D, 6B-1D, 6-B-3-0-1, 6-C-1, 6-E-2