Author	Herngreen, G.F.W., De Boer, K.F., Romein, B.J., Lissenberg, Th. and Wijker, N.C.
Year	1984
Journal	Mededelingen Rijks Geologische Dienst vol.37 pp.1-29 pl.6
Title	Middle Callovian beds in the Achterhoek, eastern Netherlands

Abstract Herngreen, G.F.W., De Boer, K.F., Romein, B.J., Lissenberg, Th. and Wijker, N.C., 1984; Middle Callovian beds in the Achterhoek, eastern Netherlands