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View of the Basalt Flows at the Yellow Stone National Park in Wyoming, USA.
Sign board reads, 'Basalt Flows - The columnar structure is caused by contraction in cooling', View of the Basalt flows at the Yellow Stone National Park in Wyoming, USA. A road runs along the length of the Basalt Flows. Vehicular traffic on the road.
Bison graze at the Buffalo Ranch in the Yellow Stone National Park, Wyoming, USA.
Sign board reads, 'Buffalo Ranch'. View of the Buffalo Ranch at the Yellow Stone National Park in Wyoming, USA. Bison graze in the field. View of sun setting.
Aircraft lay smoke screen over a wooded area in Maryland.
Activities of the U.S. Army Air Corps in Maryland. Two aircraft lay a smoke screen over a wooded area. The tail section of the aircraft in the foreground. The smoke screen covers the ground. The aircraft lay the smoke screen in a circle.
U.S. Boeing P-12 aircraft fly in a formation over the clouds in California.
U.S. Army Air Forces Boeing P-12s in flight in California. The planes fly in formation. 18 P-12s fly in a formation over the clouds.
Bombardment of a target area from B-10s in flight over California.
U.S. Army Air Corps Martin B-10 bombers B-10 planes parked on an airfield in California. Several ground crewmen carry 300 lb bombs under a B-10. Two other B-10s parked in the background. Fuse is placed in the nose of a 300lb bomb. Armament men install bombs in the bomb bay of a B-10. The bomb bay doors close. B-10s in flight. An outline of a ship marked in a desert as a target. Five officers at an observation post on the ground. The release and the descent of the 300 lb bombs. Several bombs explode on the target in the desert. A pilot at the controls of a B-10. Bombs explode on the targets. Smoke from the bombardment.
Tunnels excavated and aligned with concrete during construction of Hoover Dam, Nevada.
Early period construction of Hoover Dam. Black Canyon shows river in deep valley between cliffs. Man and materials transferred on Catwalk Bridge. Rocks blasted to make ways. Tunnels excavated in mountains by men. Men bore holes in mountain. Man work on steel rods. Trucks loaded with rocks move up the road on mountain. Trucks dump rocks. Tunnels are aligned with concrete after excavation. Men work with equipment. Rocks on top of the cliffs blasted. Men engaged in drilling and handling explosives. Workers transported through cables suspended between cliffs. Men drill holes in Canyon walls. Holes are blasted. Men suspended from cliff-top. River is diverted toward tunnel. River flows into tunnel. Trucks dump rocks. Excavation vehicles used at construction site. Shovel excavator in operation. Dump trucks are driven. Roads carved in mountains to transport men and material. Rock surfaces prepared for the reception of concrete.