Das, A.K., and S.L. Malurkar. “Kodaikanal Solar,Geomagnetic and Ionospheric Data, July-September 1952”. MAUSAM 4, no. 1 (January 1, 1953): 98–102. Accessed September 20, 2024. http://103.215.208.102/index.php/MAUSAM/article/view/4794.