https://geoscan.nrcan.gc.ca/starweb/geoscan/servlet.starweb?path=geoscan/fullf.web&search1=R=203814
Rechercher Fensome, R A; Rechercher Williams, G L; Rechercher Barss, M S; Rechercher Freeman, J M; Rechercher Hill, J M
American Association of Stratigraphic Palynologists Foundation
Périodique (revue)