Billerica bĭlrĭ´kə [key], town (1990 pop. 37,609), Middlesex co., NE Mass., on the Concord River; settled 1637, inc. 1655. An important high-tech center, its manufactures include computer hardware and software, precision instruments, and machinery. The town's historical attractions include several 17th-, 18th-, and 19th-century homes and a Native American site and burial ground dating back to 1,000 BC
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