Geodesic
The four-color problem, by Oystein Ore. Academic Press, New York, 1967. xv + 259 pages. $12.00.
Canadian mathematical bulletin, Tome 11 (1968) no. 1, pp. 161-163

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The four-color problem, by Oystein Ore. Academic Press, New York, 1967. xv + 259 pages. $12.00.. Canadian mathematical bulletin, Tome 11 (1968) no. 1, pp. 161-163. doi: 10.1017/S0008439500028915
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