The following may sometimes be of use: LOW’S English catalogue, 1835–80. Lond., 1864–82. 3 v. O. 117s., and LOW’S [Subject] index to the British catalogue, 1837–80. Lond., 1858–84. 3 v. O. 86s.

Crockford’s Clerical directory, the Medical directory of Great Britain, the Army list, and similar registers afford assistance.

The following are also often useful The Brockhaus’ Konversations-Lexikon, 13. Anfl., Lpz., 1882, etc.; Pierer’s Universal-Lexikon; the Allgemeine deutsche Biographie, Lpz., 1875–89, which has reached R in its 28th vol.; Zedler’s Grosses vollst. Univ.-Lex. 1732–54, 68 v. fº (for 17th and 18th century writers); and Wurzbach’s Biog. Lexikon des Kaiserthums Oesterreich. Wien, 1856–86. 54 v. O. {132}

For subject-cataloguing, the Dictionary of the Bible, the Dict. of Greek and Roman antiquities, and the Dict. of Greek and Roman geography are of prime importance.