Robert Ladd

Different Stuctural Styles and Histories of the Colombian Foreland: Castilla and Chichimene Oil Field Areas, East-Central Colombia

N. Tilander, C. Kluth, Robert Ladd, 1997 .

The geology of Sheep Canyon Quadrangle: Wyoming

Robert Ladd, 1979 .

Linguistic tone is related to the population frequency of the adaptive haplogroups of two brain size genes, ASPM and Microcephalin

D. Ladd, D. Dediu, Robert Ladd, 2007, Proceedings of the National Academy of Sciences.

The tone system of the Luanyjang dialect of Dinka

D. Ladd, B. Remijsen, ©Walter de Gruyter, 2008 .