Janssen, A. W. & Zorn, I. (1993). Revision of Middle Miocene holoplanktonic gastropods from Poland, published by the late Wilhelm Krach. Scripta Geologica. Special Issue 2 (9): 155-236.
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Janssen, A. W. & Zorn, I.
1993
Revision of Middle Miocene holoplanktonic gastropods from Poland, published by the late Wilhelm Krach
