Time and frequency proceedings of the seminar on time and frequency, held in National Physical Laboratory, New Delhi, november 18-20, 1976 edited by B.S. Mathur and P. Banerjee - New Delhi National Physical Laboratory 1977 - [various pagings.] Subjects--Topical Terms: NASA thesaurusTimeTime Frequency Universal Decimal Class. No.: 529.2(082.1) / SEM