Zander, Randolph, The Silver Rubles and Yefimoks of Romanov Russia, 1654-1915, Russian Numismatic Society, Bellingham, WA, 1996, 141 pages, softcover. A history of Romanov Russia and description of the large silver coinage. A nice book even if you don 't collect rubles. There are notes on activity of the mints, bibliographies, and good index. Well-illustrated throughout although not a comprehensive catalog, ex James Farr Collection Library.
Estimate: 10-20 USD