This image was acquired from
flickr. It was marked as Public Domain or CC0 and is free to use. To verify, go to the source and check the information there.
Keywords from Image Description:
elwyn h. gibbon special collection photo elwynhgibbonspecialcollectionphoto keystone aircraft keystoneaircraft keystone aircraft keystoneaircraft keystone keystone bomber keystonebomber bomber aircraft airplane biplane military aviation militaryaviation outdoor monochrome Catalog Title Elwyn H. Gibbon Special Collection Photo Additional