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Ramanujam, C. and Rao, K.P. 1971. Study of the pollen grains of ctenolophonidites from the warkalli deposits of South India with a note on the geological history of ctenolophon. Journal of Palaeosciences. 20, 1-3 (Dec. 1971), 210–215. DOI:https://doi.org/10.54991/jop.1971.898.