Transcribed from press release: "HUGHES TEST DERRICK This 118-foot field-size oil derrick tower above a block-long laboratory in Houston, Texas, where the Hughes Tool Company simulates every drilling condition in the world in order to produce tough, long-lasting drill bits for the oil industry. Rock bits are responsible for tapping of deep oil fields where today 90 per cent of the world's oil is found."
From the Howard Cannon Photograph Collection (PH-00192). Stamped on verso: "Official United States Air Force Photograph - Anderson AFB Washington 25, D.C."