Foraminifera source request
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Williams-Mitchell, E. (1948). The zonal value of foraminifera in the Chalk of England. Proceedings of the Geologists' Association. 59(2): 91-IN4.
Williams-Mitchell, E. (1948). The zonal value of foraminifera in the Chalk of England. Proceedings of the Geologists' Association. 59(2): 91-IN4.