Librarians spend a significant portion of time at their desks or in front of computer terminals; extended work at video display terminals can cause eyestrain and headaches.
Bureau of Labor Statistics, U.S. Department of Labor, Occupational Outlook Handbook, 2006-07 Edition, Librarians, on the Internet at http://www.bls.gov/oco/ocos068.htm (visited November 29, 2007).
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