TY  - RPRT
TI  - Circular of the Bureau of Standards no. 385: 
AU  - Dellinger, J H
AU  - Jolliffe, C B
PY  - 1930
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 385
DO  - 10.6028/NBS.CIRC.385
ER  -