W.A.E. Willems (1982)
Microfossil assemblages, zonations and planktonic datum levels in the Ieper formation (Ypresian s.s., early Eocene) in Belgium
Geological Survey of Belgium., vol. 1982/8 - N°194 . Professional Paper of the Geological Survey of Belgium.
RBINS Publication(s)
17 pages, 1 figure, 2 tables
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