(with Leo Frobenius) Hadschra Maktuba. Urzeitliche Felsbilder Kleinafrikas. Part 1 (of 6).
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Among his teachers at this time the most important were Albrecht Penck, Josef Szombathy and Moritz Hoernes.
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His work with Frobenius included the study of the Neolithic rock engravings of south Oran in 1925.
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