Cliff, PPFA didn't know squat about these books, you may be able to get them though PFM....
or you can order through B&N, or Amazon.
The History of European PFs. Paul Mitchell & Lynn Roberts ISBN 185894-036-2
Italian Renaissance Frames ISBN 0-8109-3455-8
The Art of the Picture Frame by Jacob Simon ISBN 1-85514-171-X
Frameworks by Paul Mitchell & Lynn Roberts 1-85894-037-0
The Bookd of Picture Frames by Clause Grimm 0-913870-92-7
Framing in the Golden Age 90-6630-278-X
The Guilded Edge by Eli Wilner 0-8118-2070-X
But don't short yourself: learn about one of the hottest influence periods in our history:
In Perfect Harmony-Picture=Frame 1850-1920 0-295-97478-8
And not to be remiss, but the Abe Munn Catalog.... I have no idea what it will look like now, but it used to be a wonderful reference book. I had it on my nightstand. Pleasent dreams . . . untill you wake up at 3am because your were making a frame.....
My wife doesn't mind when that happens as long as the hammering and sawing doesn't wake her up.