1/2 left side view of a Keystone XO-15, a military aircraft, on the ground.https://corescholar.libraries.wright.edu/special_ms223_photographs/2444/thumbnail.jp
A right side view of a Keystone XLB-6, an United States Army plane, on the ground.https://coreschola...
1/2 left side view of a Douglas XO-46, a military aircraft, on the ground.https://corescholar.librar...
1/2 right side view of a Lockheed XC-35, a military aircraft, on the ground.https://corescholar.libr...
3/4 left side view of a Keystone B-5A, a military aircraft, on the ground.https://corescholar.librar...
1/4 right side view of a Keystone plane, a military aircraft, on the ground.https://corescholar.libr...
1/2 right side view of a Keystone B-6A, a military aircraft, on the ground.https://corescholar.libra...
1/2 left side view of a Douglas XO-14, a military aircraft, on the ground.https://corescholar.librar...
Right hand side view of the Keystone B-4A, a military aircraft, on the ground.https://corescholar.li...
1/4 left hand side view of the Douglas XO-35, a military aircraft, on the ground.https://corescholar...
1/4 right side view of a Curtiss XO-16, a military plane, on the ground.https://corescholar.librarie...
1/2 left side view of a Lockheed XO2L-1, a military aircraft, on the ground.https://corescholar.libr...
1/2 left side view of a Douglas XO-31, a military aircraft, on the ground.https://corescholar.librar...
1/4 right side view of a Keystone Y1B-4, a military plane, on the ground.https://corescholar.librari...
1/2 left side view of a Douglas XO2D-1, a military aircraft, on the ground.https://corescholar.libra...
1/4 left side view of a Curtiss XO-18 military plane on the ground.https://corescholar.libraries.wri...
A right side view of a Keystone XLB-6, an United States Army plane, on the ground.https://coreschola...
1/2 left side view of a Douglas XO-46, a military aircraft, on the ground.https://corescholar.librar...
1/2 right side view of a Lockheed XC-35, a military aircraft, on the ground.https://corescholar.libr...
3/4 left side view of a Keystone B-5A, a military aircraft, on the ground.https://corescholar.librar...
1/4 right side view of a Keystone plane, a military aircraft, on the ground.https://corescholar.libr...
1/2 right side view of a Keystone B-6A, a military aircraft, on the ground.https://corescholar.libra...
1/2 left side view of a Douglas XO-14, a military aircraft, on the ground.https://corescholar.librar...
Right hand side view of the Keystone B-4A, a military aircraft, on the ground.https://corescholar.li...
1/4 left hand side view of the Douglas XO-35, a military aircraft, on the ground.https://corescholar...
1/4 right side view of a Curtiss XO-16, a military plane, on the ground.https://corescholar.librarie...
1/2 left side view of a Lockheed XO2L-1, a military aircraft, on the ground.https://corescholar.libr...
1/2 left side view of a Douglas XO-31, a military aircraft, on the ground.https://corescholar.librar...
1/4 right side view of a Keystone Y1B-4, a military plane, on the ground.https://corescholar.librari...
1/2 left side view of a Douglas XO2D-1, a military aircraft, on the ground.https://corescholar.libra...
1/4 left side view of a Curtiss XO-18 military plane on the ground.https://corescholar.libraries.wri...
A right side view of a Keystone XLB-6, an United States Army plane, on the ground.https://coreschola...
1/2 left side view of a Douglas XO-46, a military aircraft, on the ground.https://corescholar.librar...
1/2 right side view of a Lockheed XC-35, a military aircraft, on the ground.https://corescholar.libr...