The Chemistry of the Radio-elements, by Frederick Soddy.

Frederick Soddy

A Questionnaire Survey of the WEAO Radio Audience, Frederick Hillis Lumley.

Frederick Hillis Lumley

The Project Gutenberg eBook of The Radio Amateur's Hand Book, by A. Frederick Collins

The Radio Amateur's Hand Book; a Complete, Authentic and Informative Work on Wireless Telegraphy and Telephony, by A. Frederick Collins.

A. Frederick Collins