[Yoda]

mmm, the only book I know of that Bob MacDonald wrote was
Golf at a glance : the pocket pro.
Publisher: Chicago : Bruce-Roberts, 1931.
Is that the one you speak of. If so virtually impossible to find.

Nope, the book is Golf, written by Bob MacDonald and published by Wallace Press, Chicago, in 1927. The author's name is listed on the front cover as Bob MacDonald. His photograph appears inside the book above the name Robert G. MacDonald.

The book is not quite coffee-table size, but it is close. It is richly illustrated and contains line drawings, posed stills (illustrating both 'how to' and 'how not to') and action sequences taken from motion film.

The man was a supreme Golf Stroke Mechanic and well ahead of his time. In the pages of his book can be found such concepts as the left shoulder as the center of the swing arc; the right forearm/elbow pickup; the hands-controlled pivot; the left arm flying wedge (though not termed such); and a startlingly accurate description of the interaction of the left arm and right shoulder during the downstroke (the #4 Power Accumulator). Also, his drills for learning the correct action of the Pivot and the independent Arm Swing are among the best I've ever seen.