1. Typed Letter Signed ("W.W. Cargill"), 2¼ pp, 11 x 8 inches, Bridgeport, CT, June 4, 1930, to J.T. Trippe, President of Pan American Airways, offering to sell him a Sikorsky Amphibion Type S-39, on Sikorsky stationery. Together with a glossy brochure for the same; a folding schematic; approximately 34 black and white photographs, 8 x 10 inches, on printing-out paper, showing the S-39 and its components in detail.
2. Large black and white photograph, 11 x 20 inches, of the first annual dinner of the American Helicopter Society in 1944. Laid on board with tears and creases mostly at extremities, several attendees identified in ink.
3. Original illustration of the Sikorsky S-55 helicopter with vignette portrait of Igor Sikorsky, gouache and airbrush on board, 18 x 22 inches, signed lower right ("R.W. Hibbs, '44").
4. 8 black and white photographs of the S-55, 6 being 11 x 14 inches, 2 being 16 x 20 inches.
5. 4 black and white photographs of Goldsborough, Islamoff and Curtin of the ill-fated 1926 Fonck attempt to cross the Atlantic, and the engine of the Sikorsky S-35 in which they hoped to do so, mostly 8 x 6 inches.