Population, food, and knowledge.
Johnson
D G
DG
Department of Economics, University of Chicago, Chicago, IL, USA.
D000383:Agriculture / Q000266:history; D005298:Fertility; D005523:Food Supply; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans; D006815:Hunger; D019359:Knowledge; D008017:Life Expectancy; D009026:Mortality; D011158:Population Growth