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![Cover for Rudolf Fritsch · The Four-Color Theorem: History, Topological Foundations, and Idea of Proof (Pocketbok) [Softcover reprint of the original 1st ed. 1998 edition] (2012)](https://imusic.b-cdn.net/images/item/original/540/9781461272540.jpg?rudolf-fritsch-2012-the-four-color-theorem-history-topological-foundations-and-idea-of-proof-pocketbok&class=scaled&v=1611606038)
