Question: Do Tadeusz Chmielewski and John Guillermin share the same nationality?
Sentence (from "Świat Młodych"): Henryk Jerzy Chmielewski with Tytus, Romek i A'Tomek, Szarlota Pawel with Kleks series) or significants parts of them were published there (works of Janusz Christa, Tadeusz Baranowski and Grzegorz Rosiński).
Relevant evidence: No