"The World Environment: A Program For The People of Planet Earth," Eleventh Annual Grady Gammage Memorial Lecture, Arizona State University, Tempe, Arizona, February 16, 1972
A photograph of the themeda grassland with a few plants of protea abyssinica. This photograph was taken on the hills opposite the government buildings.
A photograph of grassland, showing themeda forskalii, eragrostis curvula and cymbopogon marginatus. There is acacia horrida on the mountains in the background.