000 00320nam a22001337a 4500
005 20250621121721.0
008 250621b |||||||| |||| 00| 0 eng d
041 _aeng
100 _aOre, Oystein
245 _aThe four-color problem
_c/ by Oystein Ore
260 _anew york
_bAP
_c1967
300 _a259p.
942 _cBK
999 _c40241
_d40241