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The Ordovician trilobites of Spitsbergen. III. Nr 171. Remaining trilobites of the Valhallfonna Formation
R.A. Fortey
Bok Engelsk 1980
The Ordovician Trilobites of Spitsbergen. II. Nr 162. Asaphidae, Nileidae, Raphiophoridae and Telephinidae of the Valhallfonna formation
R.A. Fortey
Bok Tysk 1975
The Ordovician Trilobites of Spitsbergen. I. Nr 160. Olenidae
R.A. Fortey
Bok Tysk 1974
The Ordovician trilobites of Spitsbergen : I. Olenidae
Fortey, R. A.
Bok Engelsk 1974
Cambrian-Ordovician rocks adjacent to Hinlopenstretet, North Ny Friesland, Spitsbergen
Fortey, R.A.
Bok Språk ikke angitt 1973