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- [13] Coal plant uses bag filters to meet EPA standards ASHRAE JOURNAL-AMERICAN SOCIETY OF HEATING REFRIGERATING AND AIR-CONDITIONING ENGINEERS, 1996, 38 (09): : 12 - 13
- [19] Louis Berger settles with U.S. on foreign bribe violations ENR (Engineering News-Record), 2015, 274 (31):
- [20] Louis Berger settles with U.S. on foreign bribe violations ENR (Engineering News-Record), 2015, 274 (30):