LEADER 00000nam 2200181 a 4500 001 0447873 003 UkHlHU 007 t 008 002810 1 1920 000 eng 040 UkHlHU 050 4 QC 661 P6 100 0 Pierce, G.W. 245 00 Electric oscillation and electric waves. 250 6th imprint. 300 0000p. 946 260 lacks |a 946 260 lacks |b 946 260 lacks |c, 008 has valid date 946 300 data invalid 946 6XX absent
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