| Authors(s) | Boekschoten, G. J. |
| Year | 1963 |
| Title | Paleoecological notes on the Septaria Clay (Oligocene) of the eastern Netherlands. Proc. Koninkl. Akad. Wetensch. Amsterdam (B)66(5): 280-295, 1 fig. |
| Authors(s) | Boekschoten, G. J. |
| Year | 1963 |
| Title | Paleoecological notes on the Septaria Clay (Oligocene) of the eastern Netherlands. Proc. Koninkl. Akad. Wetensch. Amsterdam (B)66(5): 280-295, 1 fig. |