Vol. 1: Informal Opinion C-230(a) (July 24, 1961) - Informal Opinion 866 (Feb. 24, 1966)
Vol. 2: Informal Opinion 867 (May 31, 1965) - Informal Opinion 1284 (Nov. 28, 1973)
Subject index, citator, and parallel table between the Canons of Professional Ethics and Code of Professional Responsibility are located in volume 1.
Only the latest opinions are freely available to those who are not members of the member of the Center for Professional Responsibility; members have access back to 1984.