The book can be downloaded in its entirety here:
http://www.antiquephono.org/category/book-feature/
More major additions are coming in 2016, including a book feature on Sonora Phonographs by R.J. Wakeman.
If you are not already a member of the Antique Phonograph Society and you'd like to support this activity, please consider joining. You'll receive the 52 page full-color quarterly journal, The Antique Phonograph, and share the satisfaction of helping provide resources like this to the hobby. There are many consumers; providers are fewer. Won't you join us?
http://www.antiquephono.org/join-us-home/
George P.