TY  - BOOK
AU  - Hammen, T. van der
AU  - Wymstra, T.A.
TI  - A palynological study on the tertiary and upper cretaceous of British Guiana
U1  - Pam 551.781 WI Ham 
PY  - 1965///?]
N1  - Reprinted from Leidse Geologische Mededelingen, Deel 30, Blz. 183-241, 1964
ER  -