Requests monthly reports on operations and the causes of delays and difficulties in mapping a river basin; encloses a copy [not present) of a directive from [Charles-Henri-Theodat, comte] d'Estaing to [Antoine-Jean-Louis?] Du Portal that assigns a cartography mission to Ribart; encloses a letter [present] of encouragement from Du Portal in which Calonne requests any further details in the form of a memorandum.; In French
