Correlation, Method of Least Squares, Linear Regression and the General Linear Model - Geomathematics: Theoretical Foundations, Applications and Future Developments - page 119

Fig. 4.3 Geological map of Abitibi area, which is part of the Superior Province, Canadian Shield (based on G.S.C. map 1250A by R.J.V. Douglas). Area used in
Fig. 4.4 is outlined (From Agterberg 1974 , Fig. 79A)