Word: underground
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Dates: during 1960-1969
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...bombs to blast craters deep enough to provide cover for the choppers, and a few critical cases were evacuated. Then the Marines moved out, stormed the hill with satchel charges,* and blasted the Reds out of their holes. They found a Communist regimental command post replete with underground rooms and trenches...
Taking an entirely different tack from the Rockefeller men, Michigan State University researchers have at tacked both parts of the food problem at once. Borrowing the methods and materials of highway builders, they have learned to lay down underground strips of asphalt that literally pave the way for richer crops of all varieties...
...were even more impressive. With cabbage selling at $2 per crate, the increased yield would bring a farmer added revenue of $490 per acre, allowing him to pay off the cost of the asphalt layer-about $225 per acre-with his first harvest. Furthermore, Hansen and Erickson estimate, the underground asphalt will not deteriorate for at least 15 years...
...that wheat is the only treasure of the prairie provinces. Another is potash, greatly in demand as fertilizer. Saskatchewan has so much of it underground that Premier Ross Thatcher may fairly accurately boast that his province not only grows the wheat that feeds the world, but also mines the potash that grows the wheat that feeds the world. At Esterhazy, the 3,200-ft.-deep corridors of a new $60 million International Minerals & Chemical Corp. mine glow in strobe lights, as drilling machines shear out the pink ore for export to Europe and Asia. Eleven more potash mines...
...bulk of the plant will be underground. It will be about 400 feet long, 110 feet wide, and 40 feet deep. Only a 30 foot square structure on top will be visible to strollers on the Charles...