TY  - BOOK
AU  - Alvin,Kenneth Leonard
TI  - On the two Cones Pseudoaraucaria Heeri (Coemans) nov. comb. and Pityostrobus Villerotensis nov. sp. from the Wealden of Belgium. / 
PY  - 1957///
CY  - Bruxelles : 
PB  - Musee Royal d'Histoire Naturelle, 
ER  -