TY - GEN AU - Christensen, Richard G AU - Coxon, Bruce AU - Howell, Barbara F AU - Mandel, John AU - Paule, Robert C AU - Reeder, Dennis J AU - Schaffer, Robert C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 1981-01-01 05:01:00 DO - https://doi.org/10.6028/NBS.SP.260-72 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 1981 TI - Standard Reference Materials:SRM 900, antiepilepsy drug level assay standard ER -