TY  - RPRT
TI  - Recommended unit prefixes, Defined values and conversion factors (card 1), General physical constants recommended by NAS-NRC (card 2) 
PY  - 1963
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NBS MP 253
DO  - 10.6028/NBS.MP.253
ER  -