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   ocr: Search Help AND and OR are called Boolean - operators. roucan use them to combine up to three search criteria. Category: Social Issues Category: Social Issues AND OR Time eriod:1950-1959 Time eriod:1950-1959 AND OR Free Find: Education Free Find: Education CATEGORY TIME PERIOD CATEGORY TIME PERIOD Social Issues 1950-1959 Social Issues 1950-1959 - - - FREE FIND Education FREE FIND Education