Several years ago a series of articles pertaining to pneumatic player
technology were published in the PTG Journals.  However, I really don't
know of anything in today's market.

Which is why a few years ago (when there was major talk of PPCo closing
permanently) I bought one copy of all of Player Piano Company's
reprints and have been expanding whenever I find something I don't
already have.

Duaine Hechler
Florissant, Missouri
http://www.hechlerpianoandorgan.com/