TY  - RPRT
TI  - Supplement to National Bureau of Standards Circular no. 440: 
AU  - Swindells, J F
AU  - Snyder, C F
AU  - Hardy, R C
AU  - Golden, P E
PY  - 1958
PB  - National Bureau of Standards
CY  - Gaithersburg, MD
SN  - NBS CIRC 440sup
DO  - 10.6028/NBS.CIRC.440sup
ER  -