Books by Rolf Ludvigsen
West Coast fossils
Life in stone
Upper Cambrian Lower Ordovicia
Upper Cambrian Lower Ordovicia (Life Sciences Contributions,)
Sunwaptan (Upper Cambrian) tri
Sunwaptan (Upper Cambrian) trilobites of the Cow Head Group, western Newfoundland, Canada
Franconian trilobites of New Y
Franconian trilobites of New York State
A trilobite zonation of Middle
A trilobite zonation of Middle Ordovician rocks, southwestern district of Mackenzie
The Ordovician trilobite Pseudogygites Kobayashi in eastern and arctic North America
The trilobites Bathyurus and Eomonorachus from the Middle Ordovician of Oklahoma and their biofacies significance