Coffee Break: Storafe Practices - Storages Shelves. No. FP-2012-4. January 24, 2012. By the United States Department of Homeland Security (DHS) Federal Emergency Management Administration (FEMA) United States Fire Adminstration (USFA) National Fire Academy (NFA).
http://www.usfa.fema.gov/downloads/pdf/coffee-break/cb_fp_2012_4.pdf