I have 2 golf books that pre-date the Golfing Machine that I am guessing may have been well-thumbed on Homer's bookshelf, and because they pre-dated the machine, may be all that more important in the annuls of golf instruction, that being Dante's book and my favorite, Golf-o-metrics by Joe Norwood. What other pre-Machine books could have been on Homer's bookshelf, technically compliant with the 3 imperatives?