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MR543795 (58 #27598d) 05C15
Appel, K.; Haken, W. Supplement to: "Every planar map is four colorable. I. Discharging'' (Illinois J. Math. 21 (1977), no. 3, 429–490) by Appel and Haken; "II. Reducibility'' (ibid. 21 (1977), no. 3, 491–567) by Appel, Haken and J. Koch. Illinois J. Math. 21 (1977), no. 3, 1–251. (microfiche supplement).
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