00440nam a2200169Ia 4500082001900000100002000019245002400039260003400063300001500097500000500112690000600117700000500123952010100128964001700229921000900246999001500255  a511.5bR581.MC  aRingel, Gerhard  aMap color theoremb  aBerlinbSpringer-Verlagc1974  axii, 191p.  a  a   a  00104070aISIbISId1998-09-07l0o511.5 R581.MCpDP11544r2019-02-14 00:00:00w2019-02-14yBK  abcdefg  a8938  c8938d8938