Population Reference Bureau
Population Index, Office of Population Research, Princeton University
PubMed, National Library of Medicine, National Institutes of Health
POPLINE, Center for Communication Programs, Johns Hopkins University
UnCover Company
UN POPIN, World Population Trends
International Data Base, US Census Bureau
World Population Data Sheet, Population Reference Bureau
Demographic and Health Surveys, Macro International, Inc.
Country Health Profile Series, Center for International Health Information
World Resources 1996-1997, World Resources Institute
REFWORLD, UN High Commissioner for Refugees
UNAIDS, Joint UN Programme on HIV/AIDS
Statistical Abstract of the US, US Census Bureau
County and City Data Book, US Census Bureau
National Center for Health Statistics
CIA Factbook
UN POPIN, UN Population Information Network
Demography Journal
PopNet
Worldwide Directory of Population Institutions
Environmental Organization Directory