????ü????? ?? ??? ??????????????? ??? ℜ?????? ????? (Einführung in die Kunstgeschichte von Richard Graul – Introduction to the history of Art by Richard Graul). 7th add. ed. With 1022 illustrations. Alfred Kröner Verlag in Leipzig (Leipzig: Alfred Kröner Publishing House), 1916 – 242 p. Inv. No. 168.
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