AMUNDSEN, Roald (1872-1928) and Lincoln ELLSWORTH (1880-1951). Our Polar Flight. The Amundsen-Ellsworth Polar Flight. New York: Dodd, Mead & Co., 1925. 8vo. Numerous illustrations. FIRST AMERICAN EDITION. -- AMUNDSEN, Roald and Lincoln ELLSWORTH. First Crossing of the Polar Sea. New York: George H. Doran, 1927. 8vo. Numerous photographic plates, folding route map. Provenance: Library label removed from front paste-down. FIRST ENGLISH EDITION. -- ELLSWORTH, Lincoln. Search. New York: Brewer, Warren & Putnam, 1932. 8vo. Numerous photographic plates, 3 maps. Publisher's black cloth gilt, top edge gilt. FIRST EDITION. -- ELLSWORTH, Lincoln. Beyond Horizons. London: William Heinemann, 1938. 8vo. Frontispiece, numerous half-tones, 2 maps. Provenance: Frederick I. Ordway, III (1927-2014) American space scientist and author (bookplate). FIRST BRITISH EDITION. -- All in original publisher's cloth, condition generally good.