United States. Army Division of Military Aeronautics · leaf 328
PLATE XYIL— Shelters (3) … ABn betcnne poi/ifani conteTrl, un 'Zug^' 2. Region des Flandres. 9.9.17- ksooT*- F;5o 1. Concrete shelters with double entrance, camouflaged. These shelters have since been comiected by a trench. — Same shelters with underground entrances. — Transporting cable, poles and wires visible. 2. Concrete…
Balloons · Aeronautics, Military
Internet Archive · Smithsonian Libraries · Public domain (published before 1931). Free to use for anything.
![An illustration from [Balloon notes], 1917, leaf 328](https://img.insideoutlibrary.com/img/1024/ia-balloonnotes02unit-328-0.webp)
