Wetzel, 1952
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Wetzel, W., 1952: Beitrag zur Kenntnis des dan-zeitlichen Meeresplanktons. Geologisches Jahrbuch, Hannover, v.66, p.391-419, 1 pl.
Wetzel, W., 1952: Beitrag zur Kenntnis des dan-zeitlichen Meeresplanktons. Geologisches Jahrbuch, Hannover, v.66, p.391-419, 1 pl.