TY - RPRT TI - Directory of professionaltrade organization laboratory accreditationdesignation programs AU - Hyer, Charles W AU - Hyer, Charles W PY - 1999 PB - National Institute of Standards and Technology CY - Gaithersburg, MD SN - NIST SP 831e1999 DO - 10.6028/NIST.SP.831e1999 ER -