Books by Charles Emerson Beecher
Note on a new Permian xiphosur
Note on a new Permian xiphosuran from Kansas
Studies in evolution
Othniel Charles Marsh
Outline of natural classificat
Outline of natural classification of the Trilobites
Brachiospongidae
The development of some Silurian Brachiopoda
Ceratiocaridae from the upper Devonian Measures in Warren county