>>I own Rudwick's book but it doesn't tell specifically why Beringer believed
>>what he did. I too had thought Gould wrote on the topic, but I can't find
>>it. has anyone else seen it?
This is the book I was trying to recall. You should be able to get it
through ILL from somewhere.
Beringer, Johann Bartholomäus Adam, d. 1740.
Title The lying stones of Dr. Johann Bartholomew Adam Beringer, being
his Lithographiæ Wirceburgensis. Translated and annotated by Melvin E. Jahn
and Daniel J. Woolf.
Imprint Berkeley, University of California Press, 1963.
Art
http://biology.swau.edu