Available at the authorised workplace in the National Library of Estonia, Archival Library of the Estonian Literary Museum, Tallinn University of Technology Library, University of Tartu Library and Academic Library of Tallinn University
Available in the network of the National Library of Estonia
Revision der ostbaltischen silurischen Trilobiten. Abtheilung V, Asaphiden. Lieferung III, Enthaltend die Gattungen Ptychopyge (Pseudasaphus, Basilicus und Ptychopyge sens. str.), Ogygia und Nileus
