I work in NYC, and was a few blocks from the location of the Jozef Pilsudski
Institute on Friday. I might be able to go to that part of the city on
Tuesday morning again.
I see that they're open Mon/Tue/Wed from 10 to 5. How should I ask for the
Wilfrid Cipher? Any catalog number? Is it what shows as "64/Major Witold
Langenfeld Papers/1925-1947" in
http://www.pilsudski.org/English/Collections/arch-collections.htm and as
"T.9. Opracowania: Kryptografia, Szyfr Wilfrid, Poczatki kryptografii, Szyfr
pamieciowy, maszynopisy, brak autora (bd.). " in
http://dione.ids.pl/~ijp/pol/aog2.html?
I better take the digital camera with me, the same one I used to take
pictures of the three "Russian" letters a few months ago at the Grolier
Club. Those letters turned out to be, apparently, partly handwritten in
Polish, but they turned to be very difficult to read because it uses old
Cyrillic letters (that's what I've been told by two unrelated people).
Perhaps they could help me in the library with those letters too.