Vishniac’s Werkdorp images did not include any caption information on the few existing prints of the work, and were thus difficult to identify. A small, 2¼-inch-square contact print of three young men wearing wooden clogs provided a vital clue that facilitated the attribution of this larger body of Werkdorp material, with the assistance of curators at the Jewish Historical Museum in Amsterdam. This is the only known example of a professional photographer documenting this Dutch agrarian training camp.