With the courtesy of Jens Wendel (Siegfrieds Mechanisches Musikkabinett,
Rüdesheim), we are happy to share this wonderful 139-page book.  Nine
more books are with the Staatsarchiv Leipzig; we plan to go there soon
and agree on the scanning and sharing of these books.  Please share
what you have on Hupfeld, etc., so that the entire community benefits.

http://www.en.faszinationpianola.de/downloads/1930_hupfeldbuch.pdf 

Thank you,
Marc Widuch