EPA Method 624 Internal / Surrogate Standard Back Catalog number: 92559 Manufacturer: ABSOLUTE STANDARDS Availability: In the manufacturer's stock Price on request - + Recommended 675889 Tulathromycin, 10mg Price on request 79645 2,3,4,6-Tetrachloroanisole Price on request 677540 N-Ethylthiourea, 100mg Price on request