1. A palynological study of the tertiary and upper cretaceous of British Guiana /   Publication: Leiden : Geologischen Mineralogisch Institut des Rujksuniversiteit, 1964 . p. 183-241 and 7 p. of plates : , Offprint from: Leidse geologische mededelingen, 1964 ; p. 183-241. Date:1964 Availability: Copies available: Turkeyen Campus Caribbean Research Library [QE926 H3] (2), Turkeyen Campus Science & Technology [QE926 H3] (4), Actions: Add to cart No cover image available No cover image available
2. South American savannas :   Publication: Montreal : McGill University, Department of Geography, 1967 . 71-90 p. , Reprinted from: Leidse geologische mededelingen, v. 38, 1966. Date:1967 Availability: Copies available: Turkeyen Campus Caribbean Research Library [QK938 S32 W83] (1), Actions: Add to cart No cover image available No cover image available