Many geographical publications, data and maps are available at the following websites:
CIA World Factbook
Provides information on the history, people, government, economy, geography, communications, transportation, military, and transnational issues for 267 world entities.
DataFinder - U.S. Population Reference Bureau
Information about population, health, and the environment.
United Nations World Population Information
Population estimates and projections that have been prepared by the Population Division of the Department of Economic and Social Affairs of the United Nations Secretariat
U.S. Census Bureau
Conducts data collection about the U.S. population. Demographic data on language, geography, and social and economic characteristics.
U.S. Geological Survey
Provides information about natural hazards, water, energy, minerals, and other natural resources; Also ecosystems and the environment, and the impacts of climate and land-use change.