http://www.atsdr.cdc.gov/MHMI/index.asp#bookmark05
http://www.atsdr.cdc.gov/mhmi/mhmi_v1_2_3.pdf

This guide is designed to familiarize readers with the concepts, terminology, and key considerations that affect the management of incidents of chemical contamination, to present uniform guidance for emergency care of chemically contaminated patients, to provide basic information critical to advance planning and implementation of emergency medical services strategies, and to illustrate the characteristics of hazardous materials incidents that mandate modifications to traditional emergency response, and the preparatory actions that should be taken to respond effectively to hazardous materials incidents.Published date: 01/01/1992.