Five year cumulative index included with every 5th volume, 1917- Includes Author/Title index for: 1905-1974; 1975-1984.
Vol. 1 was issued as no. 12 (called no. 10 in caption) of the cumulative Book review digest. Vol. 2 was issued in addition to the 12 numbers of the Book review digest for 1906. The annual cumulations for 1907-13 are formed by the Dec. numbers of the Book review digest; for 1914-23, by the Feb. number of the following year.