TY  - RPRT
TI  - NIST calibration services users guide 
AU  - Simmons, Joe D
PY  - 1991
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NIST SP 250e1991
DO  - 10.6028/NIST.SP.250e1991
ER  -