TY  - RPRT
TI  - NIST standard reference materials catalog 1990-91 
AU  - McKenzie, R L
PY  - 1990
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NIST SP 260e1990
DO  - 10.6028/NIST.SP.260e1990
ER  -