Book Excerpts
Excerpts from Radio Telephony for Amateurs, Stuart Ballantine, 2nd ed, 1923
Excerpts from Vacuum Tubes in Wireless Communication, Elmer E. Bucher, Wireless Press 1918, 1919
Excerpts from the 1936 "Jones" Radio Handbook
Excerpts from the 1937 Jones Radio Handbook
Excerpts from the 1937? Jones Radio Amateur Newcomer
Excerpts from the 1955 ARRL How to Become a Radio Amateur