[GreenKeys] Anyone have a (digital) copy of these? & Thanks for all the help!

[Christian Gauger-Cosgrove]

Hello everyone!

First I want to give a great big thank you for all the help and
pointers I was given in my earlier request for documentation. I''ve
also found much help from my local university's engineering library.

Now, I'm just wondering, might anyone have a digital copy of the
following texts by any chance?
1. "A History of Engineering and Science in the Bell System: The early
years (1875-1925)" Amos E. Joel, Bell Telephone Laboratories, G. E.
Schindler
2. "A History of Engineering and Science in the Bell System: Switching
technology (1925-1975)" M. D. Fagen, Amos E. Joel, G. E. Schindler,
Bell Telephone Laboratories
3. "Telephony and Telegraphy: An Introduction to Instruments and
Switching Systems (Electromechanical and Reed-Electronic)" Sydney F.
Smith
4. "Introduction to Telephone Switching" Bruce Edwin Briley

Many thanks to anyone who can provide any help!

Cheers,
Christian M. Gauger-Cosgrove