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Peter,
  Two good sources for info on pictorial maps including some
city maps of the type which you mention are:
     Holmes, Nigel  Pictorial Maps:History, Design, Ideas, Sources.
        New York: Watson-Guptill Publications, 1991.
     Southworth, Michael and Susan  Maps A Visual Survey and Design
        Guide. Boston:Little Brown, 1982.
 
   If your local library doesn't own they could probably get these
      through an interlibrary loan for you.
   Hope you enjoy them.
 
Maureen Farrell
Map Collection, Cleveland Public Library