Sentence:  In March , 1961 , representatives of the national laboratories of Australia , Canada , The Netherlands , United Kingdom , U. S. S. R. , United States , and West Germany , met at the <WSD>NBS</WSD> to devise means for reaching international agreement on a temperature scale between 10 and 90 * * f . 
Meaning of the word marked with <WSD> tags:  any number of entities (members) considered as a unit