Recherche dans la collection - Quebec citadel. Sketch showing in yellow the portion of the retaining wall in Richmond bastion proposed to be taken down and rebuilt. To accompany detailed estimate. Fortns A.E. 1870-71. Maintenance statement. Item 1. I. Luisdell, C.W. 28-9-69. E.F. Bourchier, Colonel R.E. 29 Septr 69. [architectural drawing]