1. Cherry , J. A. D. E. Desaulniers E. O. Frind P. Fritz D. M. Gevaert R. W. Gillham B. LeLievre Hydrogeologic properties and pore-water origin and age: Clayey till and clay in south-central Canada 1979
2. Day , M. J. Analysis of movement and hydrochemistry of groundwater in the fractured clay and till deposits of the Winnipeg area, Manitoba Waterloo, Ont. 1977
3. The Chalk groundwater tritium anomaly-A possible explanation;Foster;J. Hydrol. Amsterdam,1975