Herngreen et al., 1984
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Herngreen, G.F.W., De Boer, K.F., Romein, B.J., Lissenberg, T. and Wijker, N.C., 1984: Middle Callovian beds in the Achterhoek, eastern Netherlands. Mededelingen Rijks Geologische Dienst, v.37, p.1-29, pl.1-6.