TY  - BOOK
AU  - Gorsel,J.T.van
TI  - Evolutionary trends and stratigraphic significance of the late cretaceous helicorbitoides-lepidorbitoides lineage
PY  - 1975///
CY  - Utrecht
PB  - Schotanus and Jens
KW  - Geology, Stratigraphic
KW  - Cretaceous
ER  -