Patton, W.F., Cleland, C.C. and Iscoe, I. 2017. Climatological influences in mental deficiency as related to three ethnic groups. Revista Interamericana de Psicología/Interamerican Journal of Psychology. 1, 1 (Apr. 2017). DOI:https://doi.org/10.30849/rip/ijp.v1i1.428.