TY  - RPRT
TI  - Circular of the Bureau of Standards no. 430: glass stopcocks
AU  - Shepherd, Martin
PY  - 1941
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 430
DO  - 10.6028/NBS.CIRC.430
ER  -