by Charles D. Walcott
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Cambrian Geology and Paleontology
Cambrian geology and paleontology
Second contribution to the studies on th...
Cambrian trilobites
Pre-Cambrian Igneous Rocks of the Unkar ...
Descriptive notes of new genera and spec...
Treatise on Invertebrate Paleontology
Pennsylvanian invertebrates of the Mazon...
Silicified Middle Ordovician trilobites
Preliminary report on the occurrence of ...
Some remarks on the classification of th...