LEADER 00000nam 2200205 a 4500 001 0439605 003 UkHlHU 007 t 008 001610 1 1961 000 eng 040 UkHlHU 050 4 QC 1 N25 N2(28) 100 0 Essen, L. 245 04 The measurement of frequency. 260 London :|bH.M.S.O,|c1961. 300 16p. 700 0 Hope, E.G. 700 0 Morris, K. 946 6XX absent
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