Contributions to the Study of the Ordovician of Ontario and Quebec, by A. E. Wilson, J. F. Caley, J. C. Sproule and V. J. Okulitch
2 Maps of Essex County, Ontario, Canada, (showing Drift-thickness and Bedrock Contours), Preliminary Maps, Paper 52-17
Two Topographic Maps Showing Draft-thickness and Bedrock Contours, Kent County, Ontario, Canada, Preliminary Maps, Paper 52-4