USGS professional paper · 1965 · 145 citations · 0 references
Natural SciencesBiologyZoologyEvolutionary PaleontologySystematic PaleontologyVertebrate PaleontologyCephalopod PaleontologyCnidarian PaleontologyPalynomorph ClassificationPalynomorph MorphologyPterosaur PaleontologyTrilobite PaleontologyTrilobite CladisticsTrilobite Diversity PatternsTrilobite EvolutionTrilobite MorphologyTrilobite MorphometricsTrilobite PhylogenyTrilobite Systematics