Alan Brenner.
  <b>Cartographic Symbolization and Design: ARC/INFO Methods</b>.
  Publication of the Office of Information Resources Management of the
  US EPA, 1993.
  <A HREF="http://vis.cs.brown.edu/docs/pdf/bib/g/Brenner-1993-CSD.pdf.html">(pdf)</A>
  <A HREF="http://vis.cs.brown.edu/results/bibtex/Brenner-1993-CSD.bib">(bibtex:
  Brenner-1993-CSD)</A>.<br />