Foraminifera source request

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Bellen, R. C. van; Rutgers, J. G.; Soest, J. van; Witt Puyt, J. F. C. de; Rutgers, A. C. (1941). Smaller Foraminifera from the Lower Oligocene of Cuba. Koninklijke Nederlandse Akademie van Wetenschappen Proceedings. 9: 1140-1146.