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Re:A map of the entire internet as of May 1973 by dbg31415 on Monday December 12, 2016 @08:30AM (#13157882)
For a geographic representation, try:

* ARPANET Maps || http://som.csudh.edu/fac/lpress/history/arpamaps/

Re:A map of the entire internet as of May 1973 by wolfgke on Monday December 12, 2016 @10:38AM (#13158767)
As you can read there, these maps come from "Heart, F., McKenzie, A., McQuillian, J., and Walden, D., ARPANET Completion Report". This text can be obtained from http://walden-family.com/bbn/arpanet-completion-report.pdf

EDIT: For a less deep link go to http://walden-family.com/bbn/