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The US consulting firm Mercer, in a 2009 assessment ""conducted to help governments and major companies place employees on international assignments"", ranked Portland 42nd worldwide in quality of living;
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largest concentrations of computer communications firms in the U.S. Other leading industries include tourism and the manufacture of chemicals, electrical equipment, and food, textile, and paper products.
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Houston has numerous space and science research firms; electronics plants; giant oil refineries; high tech and computer technology industries; one of the world's greatest concentrations of petrochemical