The Pacifica Foundation was conceived twenty years ago by former White House Correspondent Hill in an attempt to bring people together to explore the cause of strife between individuals and nations. Mr. Hill collected $15,000 over a period of years and used the money to buy station KPFA in Berkeley, California as the Voice of Pacifica. It was the first wholly listener supported station in the country, dedicated purely and simply to presenting heterodox views which could be heard nowhere else in the commercial broadcasting spectrum. Pacifica subsequently obtained radio stations KPFK, Los Angeles, and WBAI, New York. The Exacting Ear is an anthology of the best of Pacifica's discussion broadcasts, edited- condensed in most cases- for the eye rather than for the ear. Its subdivisions include as well a statement of purpose, a history of the stations, a chronicling of the investigations by the FCC of WBAI's program balance, which is to say Pacifica's political persuation. Among those represented in essay or by transcription: Ammon Hennacy on Anarchism, William Rusher, explaining why he would not participate further in a series called Commentary, Alan Watts on Death, Ayn Rand and ""The Philosophical Vacuum,"" Erich Fromm, Hallock Hoffman, the Reverend Clarence Jordon, founder of Koinonia, an integrated community in Georgia, and particularly compelling, a junkie who defends his right to choose his preferred state of consciousness. Miss McKinney has done a skillful job.