- In no particular order -
Mechanical Television Links
Peter Yanczer's Site An archived version of the late Peter Yanczer's excellent site on mechanically scanned television.
The Narrow Bandwidth Television Association A club dedicated to all aspects of early television, based in the UK.
The New Jersey Antique Radio Club Some old books on television.
The Dawn of TV Don McLean's site specializing in Baird's Phonovision and other restored 30-line disc recordings.
La Radiovision Roger Dupouy's site about home-built mechanical television preserved on the ETF website.