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Books by Polgár, Gyula (sorted by popularity)
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Kant-breviarium: Kant világnézete és életfelfogása (Hungarian)
Immanuel Kant
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https://sendtokindle.compellingsciencefiction.com/ebooks/68183.opds
A világegyetem élete és megismerésének története a legrégibb időtől napjainkig (Hungarian)
Svante Arrhenius