ic services in areas with large numbers of immigrants, but the influx of non-American residents benefits the U.S. economy overall, according to a study released Saturday. Immigrants - both legal and illegal - may be adding as much as $10 billion to the economy each year and have little negative effect on job opportunities for most citizens, the prestigious National Research Council said.
             But the authoritative, 500-page report from the Council also provided compelling new evidence that taxpayer
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