Kallmorgen, Friedrich Hamburg 1856 - Grötzingen 1924 45 x 32,5 cm Old Willows. Oil/canvas/cardboard, signed lower right. Cf. Irene Eder, Friedrich Kallmorgen : 1856 - 1924. Monographie und Werkverzeichnis der Gemälde und Druckgraphik, Karlsruhe 1991, G260.

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