LEADER 00000nam 2200205 a 4500 001 0465066 003 UkHlHU 007 t 008 001611 1 1927 000 eng 040 UkHlHU 050 4 TK 5700 M8 100 0 Morecroft J.H. 245 00 Principles of radio communication. 250 2nd edition revised. 300 0000p. 650 0 Electric telegraphy. 650 0 Radio. 946 260 lacks |a 946 260 lacks |b 946 260 lacks |c, 008 has valid date 946 300 data invalid
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