Iulian Rosu YO3DAC / VA3IUL has made available some PDFs of radio books from the 1920s, 30s and 40's
Among the titles available are: • The Wireless Experimenters Manual (1920) - E.Bucher • Radio, Miracle of the 20th Century (1922) - F.Drinker, J.Lewis • Principles of Radio (1934) - 2nd Edition - K.Henney • Automatic Frequency Control Systems (1937) - J.F.Rider • D/F Handbook for Wireless Operators (1942) - W.E.Crook
