1. U.S. Environmental Protection Agency, Ground-Water Protection Strategy, Office of Ground-Water Protection, Washington, D.C. (Aug. 1984).
2. “Petroleum-Product Contamination of Soil and Water in New Mexico,” New Mexico Environmental Improvement Division, Santa Fe, New Mexico (Dec. 1984).
3. and , Benzene Toxicity, McGraw-Hill Book Co., New York (1977).