Collection search - 1. [Plan and section of old and new locks at the Split Rock in the St. Lawrence River - 1832] "Skeleton Plans, Longitudinal and Transverse Sections of the Ground, present Lock & proposed New One at The Split Rock" signed R.S. Piper. (RG8) C series no. 17. Br. Military Records. 2. [Plan of new Lock at the Split Rock in the St. Lawrence River - 1832] (RG8) C series no. 15. Br. Military Records. [cartographic material]

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