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On the Geographical Problem of the Four Colours

A. B. Kempe
American Journal of Mathematics
Vol. 2, No. 3 (Sep., 1879), pp. 193-200
DOI: 10.2307/2369235
Stable URL: http://www.jstor.org/stable/2369235
Page Count: 9
Subjects: Mathematics
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On the Geographical Problem of the Four Colours
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