http://www.antiquephono.org/
Just click on the "Articles" tab, go to "Book Feature" on the drop-down menu, and select Part 1 of the Sonora book. This work is so extensive, it was necessary to break it down into 5 parts!
There's also a new category under the "Articles" tab called "Period Articles." The APS just added an article from the November 1904 issue of The Technical World titled, "Making A Talking Machine." This is basically a tour through the Victor factory in 1904 - - pretty cool. Another period article will be posted later this afternoon or later this week.
Thanks to all APS members for making these and future additions possible.
George P.