Thoughts on constructing ramparts/walls
According to Jacobi, a treatise with this title was read to the Berlin Academy on July 5, 1759. According to St. Petersburg Academy records, it was presented to that Academy on December 1, 1760.
Original Source Citation
Novi Commentarii academiae scientiarum Petropolitanae, Volume 9, pp. 352-378.
Opera Omnia Citation
Series 2, Volume 17, pp.170-195.