1. Three abietaceous cones from the Wealden of Belgium;Alvin;Mém. Inst. R. Sci. Nat. Belg.,1953
2. On the two cones Pseudoaraucaria heeri (Coemans) n. comb. and Pityostrobus villerotensis n. sp. from the Wealden of Belgium;Alvin;Mém. Inst. R. Sci. Nat. Belg.,1957
3. Further conifers of the Pinaceae from the Wealden formation of Belgium;Alvin;Mém. Inst. R. Sci. Nat. Belg.,1960
4. The spore-bearing organs of the Cretaceous fern Weichselia Stiehler;Alvin;J. Linn. Soc. Bot.,1968
5. Weichselia reticulata (Stokes et Webb) Fontaine from the Wealden of Belgium;Alvin;Mém. Inst. R. Sci. Nat. Belg.,1971