Undersea Fleet. 1956. FIRST EDITION. -- Undersea City. 1958. FIRST EDITION, INSCRIBED BY BOTH POHL AND WILLIAMSON.
Both 8vo, both published in New York by The Gnome Press, both in original cloth [both Currey A, first priority] and unclipped dust jackets, BOTH FIRST EDITIONS, condition generally very good. Currey p. 406.