These are some of the recommended books that came up in the USITT session on period details.
The Bullfinch Anatomy of Antique Furniture
Antique Directory of Furniture
Authentic Decor All books by Peter Thornton were highly recommended.
Period Details - A Sourcebook for House Restoration.
Encylopedia of Furniture
Also interesting in this session was that I learned that the "bentwood" chair, that every theatre I have ever worked at seems to own in mass was #18 made by Gebruder Thonet. As I was looking up the chair I ran across another potential prop sight - the Chair Blog.