TY  - RPRT
TI  - Letter Circular 991: motor gasoline (supersedes Letter Circular 551 and 281)
PY  - 1950
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 991
DO  - 10.6028/NBS.LCIRC.991
ER  -