American Historical Association The American Historical Association (AHA) was founded in 1884 and encompasses every historical period and geographical area and serves professional historians in all areas of employment.
Institute of Historical Research The Institute of Historical Research (IHR), University of London, provides resources for historians. These resources include online articles, free event advertising, MA/PhD study, training courses, an open-access library and more.
Center for Research Libraries CRL is a consortium of North American universities, colleges, and independent research libraries. The consortium acquires and preserves traditional and digital resources for research and teaching and makes them available to member institutions through interlibrary loan and electronic delivery.
Project Gutenberg "A major source of historical electronic texts that can be searched by author or title."
Internet Modern History Sourcebook (1300s+) Provide links to the full text of primary sources in modern history.