Pygidium
Top View
- Michilogic Time Line
- Ohio Trilobites
- Calymenid and Other Ordovician Trilobites from Kentucky and Ohio
- People of the Waters” Exhibit
- The Lifestyles of the Trilobites
- Palaeozoic Arachnids and Their Significance for Arachnid Phylogeny
- (Middle Ordovician) of the Naturtejo
- United States Department of the Interior Geological Survey Short Papers For