Facts on file.
New York : Facts on File, inc.,
1940-
Loose-leaf for updating.
Cumulated in: Facts on file yearbook.
"Weekly world news digest with cumulative index."
NEXIS
Vol. 1, no. 1 preceded by two sample issues dated July 17/23 and July 24/30, 1940.
v. 6-10; 1946-50.  1 v.; v. 11-15; 1951-55.  1 v.; v. 16-20; 1956-60.  1 v.; v. 21-25; 1961-65.  1 v.; v. 26-30; 1966-70.  1 v.; v. 31-35; 1971-75.  1 v.; v. 36-40; 1976-85.  1 v; v. 41-45; 1981-85.
Facts on file yearbook