Douglas O-2C Observation Plane 

Douglas O-29 Biplane 

Douglas BT-2C Air Corps Trainer 

Douglas Observation Biplane, the O-38A 

Douglas O-2D on the Ground 

Douglas O-2M Engine 

Douglas O-2J on Ground 

Douglas O-24 Observation Biplane on Ground 

Douglas O-2 Framework 

Douglas O-25 Observation Biplane on Ground 

Douglas O-29 Observation Biplane on Ground 

O-22 Observation Plane Nose 

Douglas O-25A in Factory 

Douglas O-8 Observation Biplane on Ground 

Douglas O-2 Flight Line in Field 

Workers in Front of an Observation Biplane 

Douglas O-7 Observation Biplane 

Douglas O-22 Observation Biplane on Ground 

Douglas O-25B on Tarmac 

Mexican O-2M on Ground 

Mexican O-2M with Pilot 

Douglas O-22 Observation Biplane on Ground 

Douglas O-2 Observation Biplane Framework 

Douglas O-2B Observation Biplane on Ground 

Douglas O-2B Observation Biplane on Ground