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brian parkerThe main difference between these two booklets is that "The Monster" has a cross-grid checklist that is broken down by backs within each series, indicating availability based upon the author's (Bill Heitman) research and projected theories. Thus each card has a line of 31 potential backs available, and any back combination on a particular card that the author has concluded does not exist, he has blackened in that grid.
This booklet was put out in 1980, so I imagine some of the information in his checklist is no longer accurate or maybe incomplete (never really looked into it--not a 'back' guy). Still, this grid checklist makes it more interesting than the "Mysteries" booklet, especially for collectors of T206's interested in backs. Supposedly there was a T206 book to be published that was to include a wealth of new information/research, but it has been 'held up at the press' for close to a year now, and us vintage collectors long ago stopped holding our breaths.
Brian