[AVIATION]. LANGLEY, Samuel Pierpont and Charles M. MANLY. Langley Memoir on Mechanical Flight [from: Smithsonian Contributions to Knowledge, Volume 27, Number 3]. Washington D.C.: The Smithsonian Institution, 1911. Large 4to. 101 plates from photographs, drawings, etc. (some double?page). Later gilt?lettered green cloth. FIRST EDITION of this important monograph on Langley?s groundbreaking experiments with flight.