H. JF Hooyberghs (1976)
Remarks on the Eocene / Oligocene boundary,with some preliminary results of the study of Eocene / Oligocene planktonic foraminifera in Belgium
Bulletin de la Société belge de Géologie, vol. 85 p. 117-126.
10480, .27, .31, A, O, BRAB3, CAMP3, EOC, OLIG, PALMIC, MICROSC
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