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Friend, P.F., Alexander-Marrack, P.D., Nicholson, J. og Yeats, A.K. 1976. Devonian Sediments of East Greenland I. Introduction, Classification of Sequences, Petrographic Notes. Meddelelser om Grønland. 206, 1 (jan. 1976), 56 pp. DOI:https://doi.org/10.7146/mog.v206.141445.