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Item Certification status of commercial environmental laboratories certified by Massachusetts D.E.P.(Commonwealth of Massachusetts, Dept. of Environmental Quality Engineering, Lawrence Experiment Station, 1991-02) Massachusetts. Lawrence Experiment Station.Item Measurement of fecal coliform in estuarine water(Massachusetts Water Resources Commission, Division of Water Pollution Control, 1974) Massachusetts. Department of Public Health.; Massachusetts. Division of Water Pollution Control.; Massachusetts. Lawrence Experiment Station.Item Toxic element survey: final report(Dept. of Environmental Quality Engineering, Division of Water Pollution Control, 1975-11) Massachusetts. Division of Water Pollution Control.; Massachusetts. Lawrence Experiment Station.Item Summary Report of the First Low-Level Perchlorate Proficiency Test Study Conducted by the Massachusetts Department of Environmental Protection(Massachusetts Department of Environmental Protection, Division of Environmental Analysis, Senator William X. Wall Experiment Station, 2004-08-10)Item Certification status of commercial environmental laboratories engaged in chemical analyses of waters (1986)(Commonwealth of Massachusetts, Department of Environmental Quality Engineering, Lawrence Experiment Station, 1986) Massachusetts. Lawrence Experiment Station.