Wikipedia Pages Linking to tropicalstudies.org
Wikipedia Links
Anchor text: organization for tropical studies trees project
Anchor text: Skukuza Research Station - Organization for Tropical Studies
Anchor text: Official OTS website
Anchor text: aylor, D. W. (2003). Introduction to Physidae (Gastropoda: Hygrophila); biogeography, classification, morphology. Revista de Biología Tropical. 51(Suppl. 1): 1-263 (includes a Catalog of species, pp. 197-263).