73 Amateur Radio Today magazine is now available in full at the Internet archive. Full magazine copies are available in a variety of formats, including online-readable, PDF, ePub, and Kindle. Users can do a full-text search for the archives if you go to the Internet Archive advanced search and specify 73-Magazine as the collection to be searched. The issues are full of diy hardware hacking and electronics articles (and the ancient advertising.) A huge, easily-accessible collection for ham radio operators, early computer enthusiasts, and electronics hobbyists.

Direct URL at: http://www.archive.org/details/73-magazine