AT&T Archives: The Step-By-Step Switch
Back in 1951, a $2 million switch could serve 20,000 homes. That's $100 for each line. If each household was paying $4 a month each it would take Ma Bell two years to recoup her investment. Nowadays, thanks to microelectronics, a $2 million switch could probably serve two million homes, but now they charge $50 a month for high speed internet. Somebody is making some money.
HM01 - The Ultimate Radio Mystery
This is a pretty great overview of radio, encryption, espionage and numbers stations. It doesn't really cover any new ground, but he ties several pieces together.
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