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By "Ravn, J.P.J. (Jesper Peter Johansen), 1866-"
On Jurassic and Cretaceous fossils from north-east Greenland / by J.P.J. Ravn.
By: Ravn, J.P.J.
Publication info: Copenhagen :Printed by Bianco Luno,1911.
Contributed by: Gerstein - University of Toronto (archive.org)