TY  - RPRT
TI  - A portable calibration densimeter for use in cryogenic liquids 
AU  - Siegwarth, J D
PY  - 1981
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS TN 1035
DO  - 10.6028/NBS.TN.1035
ER  -