Maybe you've seen this before, but it was new to me and an admirable work, a well-put-together labor of love and sure seems accurate to this amateur.
I'd have thought somebody like Chuck Schmidt would be the one responsible, but all credit to
Andrea Bonfanti
(nice work , Andrea!)
I attached a small jpg but here you can find a HUGE .pdf of the same chart:
http://www.classicderosa.com/Classicderosaguide.pdf