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Delineation of industrial regions empirically has been attempted by a number of geographers. The parameters used by them, however, differ from each other. It was Trewartha and Burner (1944) who divided India into industrial regions. Subsequently, P.P. Karan anti W.M. Jenkrins (1959) demarcated the industrial regions of India. Industrial regions of India were also delineated by Spencer and Thomas (1968), R.L. Singh (1971), B.N. Sinha (1972), M.R. Chaudhry (1976), and the Centre for Monitoring Indian Economy (1971, 1982) CMIE. These scholars adopted one or more than one of the following indicators for the demarcation of industrial regions of India:
1. Number of registered factories in a region.
2. Number of industrial workers.
3. Population engaged in the secondary activities.
4. Percentage of industrial workers to the total workers.
5. Gross industrial output.
6. Production in terms of money.
In the demarcation of industrial regions, most of the experts divided India into six major and six minor industrial regions. A brief description of the industrial regions of India as demarcated by Prof. R. L. Singh has been given here (Fig. 11.17).