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Poulsen, C. and Wienberg Rasmussen, H. 1951. Geological map (scale, 1:50.000) and description of Ella Ø. Bulletin Grønlands Geologiske Undersøgelse. 3, (Feb. 1951), 1–25. DOI:https://doi.org/10.34194/bullggu.v3.6535.