Szklarski was co-author (with his own wife Krystyna Szklarska) of a trilogy about the Sioux titled Złoto Gór Czarnych (The Gold of the Black Hills).
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The books described hunting bisons, the beliefs, intertribal conflicts and the later native Americans' first contact with the white people as well as their fights.
Hagenbeck's name also appears in a series of Polish books for teenagers by Alfred Szklarski.
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