或為 Nguyen Son (二十世紀), 樹林風景圖圓盤-Probably-Nguyen-Son-(20th-century)-A-round-dish-decorated-with-landscape- (或為 Nguyen Son (二十世紀), 樹林風景圖圓盤-可能是阮孙(20世纪)——一个用风景装饰的圆形盘子-)
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Album with Views of Rome and Surroundings, Landscape Studies, page 06a: “Rome von der Porta St. Paolo”--Franz Johann Heinrich Nadorp (德国艺术家, 1794-1876)