books.google.com.ar - The aviation history of Martin aircraft. From the beginning to their demise, as such. Information on their aircraft through to Martin Marietta and to their amalgamation with Lockheed. Biplanes, monoplanes, seaplanes, piston engines, jet engines, rockets and missiles, plus projects. The whole works ?...https://books.google.com.ar/books/about/Kites_Birds_Stuff_Aircraft_of_the_U_S_A.html?id=T9v_BgAAQBAJ&utm_source=gb-gplus-shareKites, Birds & Stuff - Aircraft of the U.S.A. - MARTIN Aircraft.