A palynological study of the tertiary and upper cretaceous of British Guiana /

Leiden : Geologischen Mineralogisch Institut des Rujksuniversiteit, 1964 . p. 183-241 and 7 p. of plates : , Offprint from: Leidse geologische mededelingen, 1964 ; p. 183-241.

Place Hold on A palynological study of the tertiary and upper cretaceous of British Guiana /

South American savannas :

Montreal : McGill University, Department of Geography, 1967 . 71-90 p. , Reprinted from: Leidse geologische mededelingen, v. 38, 1966.

Place Hold on South American savannas :

University of Guyana Library Search for 'au:Hammen, Thomas van der'

A palynological study of the tertiary and upper cretaceous of British Guiana /

South American savannas :