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Lakhanpal, R., Sah, S. and Dube, S. 1958. Further observations on plant microfossils from a carbonaceous shale (Krols) near Naini Tal, with a discussion on the age of the beds. Journal of Palaeosciences. 7, (1-2) (Dec. 1958), 111–120. DOI:https://doi.org/10.54991/jop.1958.577.