User's Manual for Nfpa 921 Author:NFPA Fully updated to correlate with the 2004 NFPA 921: Guide for Fire and Explosion Investigations , the Manual is written by the International Association of Arson Investigators and published by NFPA. Many of the contributors are current or former members of the NFPA 921 Technical Committee as well as members of IAAI, so you know it's guidance you ... more »can trust.« less