Columbia subject headings:
Cycadeoidales.
Cycads, Fossil.
Paleobotany--Cretaceous.
Paleobotany--England--Weald.
Paleobotany--Jurassic.
Harvard subject headings:
Cycadeoidales.
Cycads, Fossil.
Paleobotany--Cretaceous
Paleobotany--England--Weald.
Paleobotany--Jurassic
Princeton subject headings:
Cycads, Fossil.
Paleobotany--England--Wealden.
Paleobotany--Jurassic.