Early Palaeocene marsupiate regular echinoids from NE Belgium
Jagt, J.W.M.; van der Ham, R.W.J.M. (1994). Early Palaeocene marsupiate regular echinoids from NE Belgium, in: David, B. et al. (Ed.) Echinoderms through time: Proceedings of the Eighth International Echinoderm Conference Dijon, France 6-10 September 1993. pp. 725-729
In: David, B. et al. (1994). Echinoderms through time: Proceedings of the Eighth International Echinoderm Conference Dijon, France 6-10 September 1993. A.A. Balkema: Rotterdam. ISBN 90-5410-514-3. xxiii, 940 pp., more
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