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Books about Jonczyk:
Leon Jonczyk by Leon M. and others BRETON (1977)
Leon Jonczyk: Zeichnungen by Leon and Yolanda Klessen ed. Jonczyk (1979)
Wiki information Jonczyk:
Michał Jonczyk is a Polish footballer who plays for Widzew Łódź in the Ekstraklasa. He played for the Poland national under-18 and under-19 football teams.