language: English
title: Downtonian and Devonian Vertebrates of Spitsbergen: Family Cephalaspidea, Det Norske Videnskaps-Akademii Oslo, Skrifter m Svalbard G Nordishav Et, N
titlecomplete: Downtonian and Devonian Vertebrates of Spitsbergen: Family Cephalaspidea, Det Norske Videnskaps-Akademii Oslo, Skrifter m Svalbard G Nordishav Et, N
publisher: Ayer Co Pub