Compiled from http://som.csudh.edu/fac/lpress/history/arpamaps/ and https://en.wikipedia.org/wiki/ARPANET
These maps are from Heart, F., McKenzie, A., McQuillian, J., and Walden, D., ARPANET Completion Report, Bolt, Beranek and Newman, Burlington, MA, January 4, 1978.
Folks -- I just scanned these in. They are too big, but right now I do not have the time to reduce them and try filtering out the noise. If someone does, please let me know. Larry (source: http://som.csudh.edu/fac/lpress/history/arpamaps/)
December 1969
June 1970
December 1970
September 1971
March 1972
August 1972
May 1973 schematic, showing not just nodes but individual networked mainframes
September 1973
June 1974
July 1975
July 1976
March 1977 schematic
July 1977