Why is school closed today? Unplanned K-12 school closures in the United States, 2011-2013 von Wong, Karen K, Shi, Jianrong, Gao, Hongjiang, Zheteyeva, Yenlik A, Lane, Kimberly, Copeland, Daphne, Hendricks, Jennifer, McMurray, LaFrancis, Sliger, Kellye, Rainey, Jeanette J, Uzicanin, Amra

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