Willis, J.; Brooks, D.; Bumpers, V.; Jones, R.; Kelly, T.
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Emergency Alarm Systems: Improved Emergency Alarm/Response System. Final Report. February 4, 1985-February 4, 1986.
Metropolitan Transit Authority of Harris County, Houston, TX
Urban Mass Transportation Admin., Washington, DC,
UMTA-TX-06-0042-86-1,
January 1986,
132 p.