1. San Diego County Air Pollution Control District "List of Semiconductor Manufacturers Using Toxic Gases (Arsine or Phosphine). May 1988."
2. San Joaquin Valley Unified Air Pollution Control District "San Joaquin Valley Unified APCD Toxics List. February 25, 1994."
3. Santa Barbara County Air Pollution Control District "Current Santa Barbara County Air Pollution Control District List of Air Toxic Sources. July 14, 1997."
Cal. Code Regs. Tit. 17, div. 3, ch. 1, subch. 3.6, art. 3, app A