Amos Henry Worthen

Economical Geology of Illinois, Vol. 3: Reprinted From the Original Reports of the Geological Survey, With Additions and Emendations; Published by Authority of the Legislature of Illinois, 1882 (Classic Reprint)

Geological Survey of Illinois, Vol. 7: Geology and Palæontology (Classic Reprint)

Geological Survey of Illinois, Vol. 5

Economical Geology of Illinois; Reprinted from the Original Reports of the Geological Survey, with Additions and Emendations

Economical Geology of Illinois Volume 1

Geology of Illinois

Geological Survey of Illinois. A. H. Worthen, Director. Volume III.

Economical Geology of Illinois (Volume 2)

Geological Survey of Illinois (Volume 2)

Geological Survey of Illinois, Volume 5

Geological Survey of Illinois, Volume 4

Report On the Geological Survey of the State of Iowa

Geological Survey of Illinois, Volume 6

Economical Geology of Illinois Volume 3

Geological Survey of Illinois, Volume 7

Geological Survey of Illinois, Volume 8

Economical Geology of Illinois