ARPANET logical map circa 1977
ARPANET
1977
The Computer History Museum (<a rel="nofollow" class="external autonumber" href="http://www.computerhistory.org">[1]</a>), <a href="https://en.wikipedia.org/wiki/File:Arpnet-map-march-1977.png" class="extiw" title="en:File:Arpnet-map-march-1977.png">en:File:Arpnet-map-march-1977.png</a>