Skevington, D., 1963.

Graptolites from tje Ontikan limestones (Ordovician) of Öland, Sweden. I. & II/.

Bull. Geol. Inst. Univ. Uppsala, 42:,

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pp. 1-42, 81 figs., refs.; 43: pp. 1-74, 73 figs., refs. Two offprints, orig. wrappers. - I: Dendroidea, Tuboidea, Camaroidea, and Stolonoidea. II: Graptoloidea and Graptovermida.