Boeing 40A
Encyclopedia
External links
- Boeing History – Boeing Model 40A Commercial Transport Retrieved June 17, 2006.
- One-of-a-Kind Restored Boeing 40 Flying To AirVenture (2008, Oshkosh, Wi. Photos included)
- Prelude to AirVenture appearance, 7 minute video, accessed 8 August 2008
- Pemberton-Tobin-Scott transcontinental air mail re-enactment
- Pemberton and Sons Aviation Website