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These collections from the Library of Congress include various kinds of maps from different periods. For example, you can search in the World Digital Library collection for maps from around the world (link below this one).
Bibliographic citations on population studies and demography through history. All world areas are covered, with roughly 70-percent of records treating Europe, and all historical time periods are also covered. Topics covered include: spatial distribution of populations; mechanisms of population change, including mortality, fertility, and migration; marriage and the family; population structures; relationships between economic, social, and population variables; methods and techniques of historical demography, including palaeodemography.
The International Data Base (IDB) provides accurate and timely demographic measures of over 200 countries and areas of the world. The IDB includes a comprehensive set of indicators such as total population, population by age and sex, and demographic characteristics such as fertility, mortality, and migration.
The Portal aims to serve as a unique access point to timely, comprehensive migration statistics and reliable information about migration data globally. The site is designed to help policy makers, national statistics officers, journalists and the general public interested in the field of migration to navigate the increasingly complex landscape of international migration data, currently scattered across different organisations and agencies.