A thread from the Geometry Forum newsgroup archive
4-colour map problem
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- 4-colour problem for planes AND...??? by Paul Cox on 03/14/95.
- Re: 4-colour problem for planes AND...??? by Henri Picciotto on 03/14/95.
- Re: 4-colour Map Problem on the plane & ...??? by Bradley Brock on 03/17/95.
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