TY  - RPRT
TI  - "Interchangeable ground-glass joints, stopcocks, and stoppers: second edition" 
PY  - 1934
PB  - National Bureau of Standards
CY  - "Gaithersburg, MD
SN  - NBS CS 21-34
DO  - 10.6028/NBS.CS.21-34
ER  -