Fig I The ground plan of the grotto, and of the monument placed before it Fig II The plan of the part above the cornice - Stuart James & Revett Nicholas - 1787, 1794

James stuart & nicholas revett. The antiquities of athens measured and delineated by james stuart f. R. S. And f. S. A. And nicholas revett painters and αrchitects, vol. Iii (ed. Willey reveley), london, john nichols, 1794. Date: 1794.