A national directory of 911 systems : final report - Yamaoka, B. K.; Yung, Terrence J.; United States. Bureau of Justice Statistics; SRI International. Center for Systems Development (Washington, D.C. : The Bureau, 1980)
"Center for Systems Development, SRI International."
"September 1980."
Keywords: Public safety radio service -- United States -- Directories; Emergency communication systems -- United States -- Directories