石渠寶笈初編(養心殿),上冊,頁662&*故宮書畫錄(卷五),第三冊,頁476&*故宮書畫圖錄,第九冊,頁201-202&* 郭甸,字海田,河南人,生卒年不詳。此幅畫宿雁群鴉,黑色秀潤有致,木石尤佳,深得用水之妙。&* Little is known of the life of Kuo Tien other than that he was from Honan and his style name was Hai-t’ien. This painting depicts nesting geese at the foot of a tree in which are clustered a flock of crows. The soft tones of color are very graceful and gentle in touch, and the tree and rocks are especially well done. Kuo T’ien exhibits a remarkable skill in manipulating washes.