TY - GEN AU - Thomas, Jeanice M. Brown AU - Duewer, David L. AU - Kline, Margaret C. AU - May, Willie E. AU - Margolis, Sam A. AU - Craft, Neal E. AU - Sharpless, Katherine E. C2 - , National Institute of Standards and Technology, Gaithersburg, MD DA - 2015-09-01 04:09:00 DO - https://doi.org/10.6028/NIST.IR.7880-34 LA - en PB - , National Institute of Standards and Technology, Gaithersburg, MD PY - 2015 TI - NIST Micronutrients Measurement Quality Assurance Program Winter, Spring, and Fall 1990 Comparability Studies: Results for Round Robins XVIII, XIX, and XX Fat-Soluble Vitamins and Carotenoids in Human Serum: ER -