Pennsylvanian invertebrates of the Mazon Creek area, Illinois.
Subtitle: Trilobitomorpha, Arthropleurida
By: Eugene S. Richardson, Jr., Curator of Fossil Invertebrates.
Series: Fieldiana -- v. 12, no. 4; In Chicago Natural History Museum. Publication -- 785; Publication (Chicago Natural History Museum) -- 785
Publisher: Chicago Natural History Museum
Published: 1956
Place of publication: [Chicago]
Subjects: Invertebrates, Fossil.; Paleontology -- Pennsylvanian.; Paleontology -- Illinois -- Grundy County.; Paleontology -- Illinois -- Will County.
Other titles: Pennsylvanian invertebrates of the Mazon Creek area, Illinois; Trilobitomorpha, Arthropleurida