Eric Walker added The Black Death led to the demise of feudalism. Could this pandemic have a similar effect? | Salon.com to a number of topics
Eric Walker added How the Little Ice Age Changed History | The New Yorker to Little Ice Age, Middle Ages and Age of Enlightenment
Eric Walker added Little Ice Age - Wikipedia to Little Ice Age
Eric Walker added a number of topics and a number of links to Geologic time scale (GTS), and added Geologic time scale (GTS) to Geology and History, prehistory and geologic time
Eric Walker added a number of links to Little Ice Age, and added Little Ice Age to Middle Ages and Geologic time scale (GTS)
Eric Walker added Little Ice Age and a number of links to Middle Ages, and added Middle Ages to Ancient, classical, medieval and enlightenment history