TY  - RPRT
TI  - Letter Circular 490: the availability to the public of the research and testing facilities of the National Bureau of Standards
PY  - 1937
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - LCIRC 490
DO  - 10.6028/NBS.LCIRC.490
ER  -