TY - RPRT TI - NIST measurement services : gas flowmeter calibrations with the 34 L and 677 L PVTt standards AU - Wright, John D AU - Johnson, Aaron N AU - Moldover, Michael R AU - Kline, Gina M PY - 2004 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST SP 250-63 DO - 10.6028/NIST.SP.250-63 ER -