License, verbatimCC0
The Metropolitan Museum of Art: Open Access, Creative Commons Zero (CC0). Flagged isPublicDomain=true in the museum's own record.
Pierre Contant d'Ivry. Plan of the Roof and Section of a Pavilion in the Gardens of the Château de Saint-Cloud (recto); Study for the Exterior with Partial Plan of the Pavilion (verso), 1750. The Metropolitan Museum of Art.