Northern Arizona University. Provides historical and current information on the economic and geographic factors that drive development and the distribution of population centers in the major geographic regions of the United States. Population Action International. Why Population Matters. Princeton's Population Index Service.
Indices have citations of numerous studies on many different aspects of population.
United Nations Population Division. Many links to worldwide information sources on population and development. Perils - Swarming the Shores. The Mediterranean Oceanic Database is also accessible. Has links to printed references on population and coastal impacts.