Title: Biostratigrafii︠a︡ i trilobity verkhnego kembrii︠a︡ i nizhnego ordovika severo-zapada Sibirskoĭ platformy
Subjects: Paleontology, Trilobites
Places: Northwestern Siberia, Russia (Federation), Russian S.F.S.R., Siberia
Time periods: Cambrian, Ordovician