• The Usenet maps published in the early 1980s were also the best available maps of UUCP.
• Although not intended for routing e-mail, they were widely used for that purpose.
• The real UUCP net was at least double the size of Usenet, including many UNIX hosts that did not have Netnews.
People used these Usenix maps to address their email.
More early Usenet maps can be found here.