EPA Method 8270C Pesticide Mix #20 Back Catalog number: 91003 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 66183 2,2',3,4,4',5',6-Heptachlorobiphenyl (183) Price on request 59967X Calibration Std. #2 Price on request 73602 Oxytetracycline, 1000μg/ml in MeOH, 1ml Price on request