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

Drawing. Date: 1780s (?). Dimensions: sheet: 4 1/8 x 9 1/4 in. (10.5 x 23.5 cm). Medium: graphite on laid paper, gray wash, pen and gray ink. Collection: Metropolitan Museum of Art. Design for Rock-work at Virginia Water, Windsor Great Park MET DP821084