U.S. Geological Survey Fact Sheet 167–95, revised 1998
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Last modified June 15, 2012
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Ҫelebi, M., Page, R.A., and Seekins, L., 1995, revised 1998, Building safer structures: U.S. Geological Survey Fact Sheet 167–95. (Available at http://pubs.usgs.gov/fs/1995/0167/.)