Some other Web sites pertaining to the history of radio and ham radio:

• The ARRL’s own history pages
• Wikipedia synopsis
• Timeline from AC6V
• Very Detailed History of Radio by Thomas H. White
• K2TQN’s Old Radio and Radio History site
• NASA’s chart of the solar cycles from 1610 to the present
• US Commerce Department Lists of Radio Stations, from 1920-21, sorted various ways, digitized by Google