TY  - BOOK
AU  - NATIONAL PHYSICAL LABORATORY
ED  - NATIONAL PHYSICAL LABORATORY
TI  - Annual report,1969-70
U1  - X9(C).281.N70<N69r, L0 
PY  - 1970///
CY  -  New Delhi 
PB  - NPL         
N1  - Appendix :27-50p
ER  -