Design for Rock-work at Virginia Water, Windsor Great Park, Thomas Sandby, 1780s (?)

Drawing. Date: 1780s (?). Dimensions: sheet: 5 1/16 x 6 9/16 in. (12.8 x 16.6 cm). Medium: graphite on laid paper, ink, pen, wash. Collection: Metropolitan Museum of Art. Design for Rock-work at Virginia Water, Windsor Great Park MET DP821080