Professor Knatschke, selected works of the great German scholar and of his daughter Elsa, collected and illustrated by Hansi, 1917 聰明的貓頭鷹在書上 books、Books、externalsource、knowledge、owl、wise 圖書、圖書、外部源、知識、貓頭鷹、明智的 資料來源：openclipart ( https://openclipart.org/ )
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