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Mõned uued andmed Kukruse lademe stratigraafiast ja faunast : [ette kantud Tartu Ü. j.o. Loodusuurijate Seltsis 22. III 1923, hiljemate täiendustega] = Stratigraphical and paleontological supplements on the Kukruse stage of the ordovician rocks of Eesti (Estonia)