Source: U.S. Geological Survey, Reston, Va. Total shipments of portland and blended cement in the United States and Puerto Rico were about 5.7 million mt in April 2011, according to the U.S. Geological Survey. This was 14.0 percent lower compared with shipments for April 2010. Total shipments for the year through April were approximately 18.3 million mt, about 2 percent…
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