1. A geological reconnaissance of the region around the inner part of Danmarks Fjord, northeast Greenland;ADAMS;Meddelelser om Grønland,1953
2. Late Ordovician and Early Silurian articulate brachiopods from Oklahoma, southwestern Illinois, and eastern Missouri;AMSDEN;Oklahoma Geological Survey, Bulletin,1974
3. Upper Bromide Formation and Viola Group (Middle and Upper Ordovician) in eastern Oklahoma;AMSDEN;Oklahoma Geological Survey, Bulletin,1983
4. The un-named Silurian(?) dolomite formation, Børglum Elv, central Peary Land;ARMSTRONG;Rapport Grønlands Geologiske Undersøgelse,1981
5. Bibliographic Index of American Ordovician and Silurian fossils;BASSLER;Bulletin of the United States National Museum,1915