License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Charles Frederick Bielefeld. Illustrated Tariff of the Improved Papier-Mâché Picture Frames, also, Enriched Mouldings, made by machinery in twelve feet lengths, without join, [about 1847]. The Metropolitan Museum of Art.