The first published work on creating speed-figures was E.W. Donaldson's Consistent Handicapping Profits (1936), which was cited by Jerry Brown as the method on which the Ragozin and Brown "sheet" figures are based.
E.W. Donaldson's book, "Consistent Handicapping Profits," was a key source of information for developing speed-figure methodology, particularly for Jerry Brown's "sheet" figures, which were built upon the foundation laid by Ragozin's work.