TY  - RPRT
TI  - Letter Circular 320: automobile engine lubricating oils (supersedes Letter Circular 298)
PY  - 1932
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 320r1932
DO  - 10.6028/NBS.LCIRC.320r1932
ER  -