History of Technology in India, Vol. I: From Antiquity to c. 1200 A.D. v1.c11.s3.t1.15

Agrawal, D.P.: 1976, “Ancient copper workings: some new ¹⁴C dates”, in Margabandhi, C. and Sekar, N.C., *IJHS* **11(2)**, 133-136.