Columbia subject headings:
Ammonoidea.
Paleontology--Jurassic.
Paleontology--Russia (Federation)--Siberia.
Harvard subject headings:
Ammonoidea.
Paleontology--Jurassic
Paleontology--Russia (Federation)--Siberia
Princeton subject headings:
Ammonoidea--Russia (Federation)--Siberia, Northern.
Paleontology--Jurassic.