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