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《罗马和周围景色画册，景观研究》，第49a页：Franz Johann Heinrich Nadorp的松果常绿枝研究-Franz Johann Heinrich Nadorp
Album with Views of Rome and Surroundings, Landscape Studies, page 49a: Study of a Evergreen Branch with Pinecone–Franz Johann Heinrich Nadorp (德国, 1794-1876)
