1. A palynological study of Holocene sediments in the Amazon basin;Absy,1979
2. Atlas of seeds and small fruits of Northwest-European plant species with morphological descriptions. Part 3: Salicaceae-Cruciferae;Berggren;Swed. Nat. Sci. Res. Counc. Stockholm,1981
3. Sacoglottis, recent and fossil;Berry;Am. J. Sci.,1922
4. Pliocene fossil plants from Eastern Bolivia;Berry;Johns Hopkins Univ. Stud. Geol.,1922
5. Fossil fruits of the Eastern Andes of Colombia;Berry;Bull. Torrey Bot. Club,1924