Heesch, Heinrich. — Untersuchungen zum Vierfarbenproblem.
Mannheim, Wien, Zürich, Bibliographisches Institut, 1969 19 x 12.5 cm, paperback, 290, (14) pages, Text in German, very good condition, slightly age-toned, see picture. Hochschulskripten Bibliographisches Institut, vol. 810/810a/810b.
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Numero libro:
81261
€16.00 ($17.64 | £13.35 | ¥2,816)
