See list of these as well as lists of special indexes in A.
General Indexes To Periodicals.
Lists of the separate indexes to particular series are given in H.
Two needles (for some letters, one only) were acted upon at the same time, and the letter at the point of intersection of the direction of the indexes was read.
Ellis, General Introduction to Domesday Book (1833), 2 vols., containing valuable indexes to the names of persons; N.