TY  - RPRT
TI  - Letter Circular 523: lubrication - publications by staff of the National Bureau of Standards 1910-1937
PY  - 1938
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 523
DO  - 10.6028/NBS.LCIRC.523
ER  -