TY - RPRT TI - NIST measurement services : regular spectral transmittance AU - Allen, David W AU - Early, Edward A AU - Tsai, Benjamin K AU - Cooksey, Catherine C PY - 2011 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST SP 250-69 DO - 10.6028/NIST.SP.250-69 ER -