TY  - RPRT
TI  - Letter Circular 289: a convenient mixture for testing the operating efficiency of a distilling column (A.P.I. project 6)
PY  - 1930
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 289
DO  - 10.6028/NBS.LCIRC.289
ER  -