TY  - GEN
AU  - Wijmstra, T.A.
AU  - Hammen, T van der
TI  - Palynological data on the history of tropical savannas in nothern South America
U1  - Pam 581.5 
PY  - 1967///
CY  - Montreal
PB  - McGill University, Department of Geography
N1  - Cover title : South American savannas : comparative studies, Colombia and Guyana. - Reprinted from Leidse Geological Mededelingen, vol. 38, 1966, p. 71-90
ER  -