TY  - RPRT
TI  - Circular of the Bureau of Standards no. 477: testing of hydrometers
AU  - Peffer, Elmer L
AU  - Blair, Mary G
PY  - 1949
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 477
DO  - 10.6028/NBS.CIRC.477
ER  -