[GreenKeys] the greenbook series (AT&T books)

[amourdutigre]

Hi, 

Does anyone know how many editions there are to the Principles of Electricity applied to Telephone and Telegraph Work as published by AT&T? I have the 1953 and the 1961 versions. I found a 1941 version, but I am not sure that I want to pay what the seller wants. I would like to get all of the editions.

My second question is this: are there any other series of books or individual books that you would recommend for a library on TTY, telegraphy and telephony?

Thanks much, and I am glad to see that Greenkeys is back up and running. 

73

Joe KB0TXC
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