Picryl description: Public domain image of a bomber aircraft, military aviation, air forces, free to use, no copyright restrictions.
Digital Photographs Relating to the Environment Public domain scan of oil tank, gas tank, free to use, no copyright restrictions image - Picryl description
Lichen Islandicus Bot. - Blutlungenmoos Public domain photograph of medieval botanical illustration, illuminated manuscript, free to use, no copyright restrictions image - Picryl description