Columbia subject headings:
Gastropoda, Fossil.
Paleontology--Cretaceous.
Paleontology--Jurassic.
Paleontology--Russia (Federation)--Siberia.
Harvard subject headings:
Gastropoda, Fossil.
Paleontology--Cretaceous
Paleontology--Jurassic
Paleontology--Russia (Federation)--Siberia
Princeton subject headings:
Gastropoda, Fossil.
Paleontology--Cretaceous.
Paleontology--Jurassic.
Paleontology--Russia (Federation)--Siberia.