TY  - RPRT
TI  - Annual report of the Director of the Bureau of Standards to the Secretary of Commerce for the fiscal year ended June 30, 1931 
PY  - 1931
PB  - National Institute of Standards and Technology
CY  - Gaithersburg, MD
SN  - NBS MP 131
DO  - 10.6028/NBS.MP.131
ER  -