TY  - BOOK
AU  - NATIONAL PHYSICAL LABORATORY
ED  - NATIONAL PHYSICAL LABORATORY
TI  - Annual report,1970-71
U1  - X9(E).281.N74<N70r, L4 
PY  - 1974///
CY  -  New Delhi 
PB  - NPL         
N1  - Appendix :46-156p
ER  -