Seabury Paperbacks

Publisher: Seabury Press

Years: 1964-

SEABURY PRESS, PW, June 8, 1964, at 116 (announcing seven paperback reprints for September 10, 1964). 

Harper Sell Seabury Trade Books, PW, Mar. 29, 1965, at 27. 

Goes, at least, to SP 63 (1969) if not further.