Gallup opinion index.
- [Princeton, N.J. American Institute of Public Opinion, etc.]
- no. ill., maps, ports.
- report no. 1- June 1965-
On cover, 1965-: Gallup-International.
Vols. for 1965-May 1966 issued by the American Institute of Public Opinion; June 1966- by Gallup International, inc.; <, Apr. 1976-> by American Institute of Public Opinion.