第48篇The Commercialization of Agriculture in the United States

第80篇Chemical and Biological Weathering of Rocks

第112篇Olmec Art

第144篇Newspaper in Western Europe

第176篇Costs and Benefits of Dispersal

第208篇Costs and Benefits of Social Life

第240篇Poisonous Insects and the Birds that Eat Them

第272篇Day Length and Flowering Plants

第304篇The Absence of Snakes in Ireland

第336篇Transitions in World Populations