Collins, A.F. The radio amateur's hand book : a complete authentic and informative work on wireless telegraphy and telephony : fully illustrated with original drawings and diagrams made especcially for this book / by A. Frederick Collins; A.F. Collins .— : George G. Harrap & CO. LTD. — 361 с. — Lang: eng .— URL: https://rucont.ru/efd/105658 (дата обращения: 26.11.2025)