TY - RPRT TI - Economic Analysis of Restricting Aggregate-Surfaced Roofing Systems in Tornado-Prone Areas of the U.S. AU - Kneifel, Joshua AU - Levitan, Marc AU - Phan, Long AU - Smith, Thomas AU - Butry, David AU - Thomas, Douglas PY - 2016 PB - National Institute of Standards and Technology SN - NIST TN 1930 DO - 10.6028/NIST.TN.1930 ER -