Professor G. Erdtman visiting Palynology Laboratory of Oil & Natural Gas Commission, Dehradun, India, March, 1957

Back row: A. K. Ghosh, Gunni and Gunnar Erdtman, C. P. Varma, Y. K. Mathur, S. K. Srivastava, N. G. Lukose, S. Sondhi, (unidentified)
Front row: J. Sen, A. Thomas