NPL : jubilee book of the National Physical Laboratory /
Langdon-Davies, John,1897-1971.
Great Britain.Department of Scientific and Industrial Research.
Great Britain.Central Office of Information.
London : H.M. Stationery Office,
1951.
"Prepared for the Dept. of Scientific and Industrial Research by the Central Office of Information"--P. facing t.p.
National Physical Laboratory (Great Britain)