A.  Graham, ?LATE TERTIARY PALEOALTITUDES AND VEGETATIONAL ZONATION IN MEXICO AND CENTRAL-AMERICA?, Acta Botanica Neerlandica, vol. 38, pp. 417-424, 1989.

A.  Graham and Dilcher, D. L., ?Studies in neotropical paleobotany. XII. A palynoflora from the Pliocene Rio Banano Formation of Costa Rica and the Neogene vegetation of Mesoamerica?, American Journal of Botany, vol. 85, pp. 1426-1438, 1998.

A.  Graham, ?MIOCENE COMMUNITIES AND PALEOENVIRONMENTS OF SOUTHERN COSTA-RICA?, American Journal of Botany, vol. 74, pp. 1501-1518, 1987.

A.  Graham, ?TROPICAL AMERICAN TERTIARY FLORAS AND PALEOENVIRONMENTS - MEXICO, COSTA-RICA, AND PANAMA?, American Journal of Botany, vol. 74, pp. 1519-1531, 1987.

A.  Graham, ?STUDIES IN NEOTROPICAL PALEOBOTANY .5. THE LOWER MIOCENE COMMUNITIES OF PANAMA - THE CULEBRA FORMATION?, Annals of the Missouri Botanical Garden, vol. 75, pp. 1440-1466, 1988.

A.  Graham, ?STUDIES IN NEOTROPICAL PALEOBOTANY .6. THE LOWER MIOCENE COMMUNITIES OF PANAMA - THE CUCARACHA FORMATION?, Annals of the Missouri Botanical Garden, vol. 75, pp. 1467-1479, 1988.

R. J.  Burnham and Graham, A., ?The history of neotropical vegetation: New developments and status?, Annals of the Missouri Botanical Garden, vol. 86, pp. 546-589, 1999.