Diagram of how monuments were recast
This diagram shows how in the 20th century the original cast-iron monuments were reset with cement to stabilize them.
International Boundary Commission. Joint report upon the survey and demarcation of the boundary between the United States and Canada from the source of the St. Croix River to the St. Lawrence River. Washington: Government Printing Office, 1925. Pg. 108. http://hdl.handle.net/2027/mdp.39015027042541