UFO Journal Issue:
“U.F.O. Investigator”, 
July-August 1968
(National Investigations Committee
on Aerial Phenomena, Washington, D.C.)

Source: CUFOS.org

This issue focuses mainly on the U.S. Congress 1968 UFO Symposium (Hearings before the Committee on Science and Astronautics, U.S. House of Representatives, Ninetieth Congress, Second Session, 29 July 1968):

http://cufos.org/UFOI_and_Selected_Documents/UFOI/043%20JUL-AUG%201968.pdf

(nicap.org image)