Middle and Upper Devonian Porolepiformes from East Greenland with Special Reference to Glyptolepis Groenlandica N.Sp. and a Discussion on the Structure of the Head in the Porolepiformes
Illustrated in b/w with 108 figures in the text, and 35 plates with notes. Meddelelser om Grønland Bd. 187, nr. 2. From the library of the Danish Meteorological Institute with its stamp and date.