A good bibliography of early printed works covering this topic can be found
in R W Scribner, "For the sake of simple folk", Oxford, Clarendon Paperbacks
1994.
Also, you might particularly want to look at
P. Melanchthon, "Deuttung der czwo grewlichen Figuren", Wittenberg, J. Rau,
1523 fols. Ai and Aii, BL
John Hall
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