Thank you Dorado -- that was an interesting article. And thank you erafjel for the follow-up info about the importance of getting the Duplessy version (since those are the numbers I'm seeing in Numista). Yes I saw the very high prices on Amazon
. So I started looking for alternatives and found that Stanford University (which is only about an hour from me) has a reference copy in their library. I might just drive down there and look it over, maybe take some notes.