LS-Dimitri Mitropoulos, thank you letter to contributors; LS-Floyd G. Blair, thank you letter to contributors; station listings; samples of materials sent to members; Mitropoulos appeal to radio listeners; Tabulation of broadcasting of concerts, from 1922-23 through 1966-67; Article by John Crosby in New York Herald Tribune, 31 December 1952, on the 700th New York Philharmonic radio broadcast; Script of radio broadcast of 27 April 1963 featuring composer/conductor Paul Hindemith