Lagaaij, R. (1952). The Pliocene Bryozoa of the Low Countries and their bearing on the marine stratigraphy of the North Sea region. Mededelingen van de Geologische Stichting. 5: 6-233.
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Lagaaij, R.
1952
The Pliocene Bryozoa of the Low Countries and their bearing on the marine stratigraphy of the North Sea region