00683nab a2200205 4500 20260520000122.0 260224s xxu Palynology and chrosnostratigraphy of the upper cretaceous in the subsurface of the barinas area, western Venezuela 12/09/06 ; 02/08/02 20 p. AAPG Bulletin Vol. 82, No. 7 (jul. 1998), p. 1308-1328 ARTICULO Helenes, J. 13955 De Guerra, C. 13956 Vasquez, J. 7645 De Guerra, C. 13956 Vasquez, J. 7645 Helenes, J. 13955 138192 138192 0 0 0 0 209011 BAAB BAAB 2026-03-04 200016378 0 200016378 2026-03-04 15:24:07 2026-03-04 ARTICULO