The ERG is primarily applicable for hazardous materials transported by highway and railway, but also is applicable for materials transported by air or waterway, as well as by pipeline. It was first issued by the US Department of Transportation in 1973, but later became a joint publication of the Department of Transportation (US DOT), Transport Canada (TC), and the Secretariat of Communications and Transportation (SCT) of Mexico, with collaboration with the Chemistry Information Center for Emergencies (CIQUIME) of Argentina. The ERG is issued every 4 years, with editions now being published in Spanish (Guía de Respuesta en Caso de Emergencia). In 1996 it was published as the North American Emergency Response Guidebook, but by the next publication in 2000 "North American" was removed due to its use by several South American countries).