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1: Alaska 2: Bird abatement 3: Maximum mid-expiratory flow rate 4: Soil 5: Range 6: Community 7: Periplaneta americana 8: Human 9: Weed 10: Feeder 11: Environment 12: Lactation 13: Fishery 14: Plant 15: Function 16: Contamination 17: Process 18: Hydrocarbon Mixture 19: Japan 20: Climate Change (As of 17:30)
Exposure indicator (Deleted term 1993. See Stressor indicator.)