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Steelworkers guide a 34 ton steel grillage into place 70 feet below street level at the site of the World Trade Center in New York, August 6, 1968. The grillage is a complex of steel constructed in three tiers and is the first of 28 that will support the core columns of the 1350 foot high north tower. The grillage is 11 feet wide, 15 feet long, and 7 feet high. (KEYSTONE/AP Photo/Anthony Camerano) (KEYSTONE/AP/Anthony Camerano)