Calisphere provides free access to unique and historically important artifacts for research, teaching, and curious exploration. Discover over two million photographs, documents, letters, artwork, diaries, oral histories, films, advertisements, musical recordings, and more.

The Library of Congress is the largest library in the world, with millions of books, films and video, audio recordings, photographs, newspapers, maps and manuscripts in its collections. 

Oxford Reference is the premier online reference product, spanning 22 different subject areas, bringing together 2 million digitized entries across Oxford University Press’s Dictionaries, Companions and Encyclopedias.

CIA World Factbook

The World Factbook provides basic information on the history, people, government, economy, energy, geography, environment, communications, transportation, military, terrorism, and transnational issues for 258 world entities.

NPR is an independent, nonprofit media organization that was founded on a mission to create a more informed public. Every day, NPR connects with millions of Americans on the air, online, and in person to explore the news, ideas, and what it means to be human. Through its network of member stations, NPR makes local stories national, national stories local, and global stories personal.

The United Nations is an international organization founded in 1945. Currently made up of 193 Member States, the UN and its work are guided by the purposes and principles contained in its founding Charter.

is dedicated to providing the inquisitive public with comprehensive, reliable, and accurate information concerning the history of African Americans in the United States and people of African ancestry in other regions of the world. 

The SlaveVoyages website is a collaborative digital initiative that compiles and makes publicly accessible records of the largest slave trades in history. 

MedlinePlus is an online health information resource for patients and their families and friends. It is a service of the National Library of Medicine (NLM), the world's largest medical library, which is part of the National Institutes of Health (NIH).

The Internet Archive, a 501(c)(3) non-profit, is building a digital library of Internet sites and other cultural artifacts in digital form. Like a paper library, we provide free access to researchers, historians, scholars, people with print disabilities, and the general public. Our mission is to provide Universal Access to All Knowledge.

The Folger Shakespeare Library makes Shakespeare’s stories and the world in which he lived accessible. Anchored by the world’s largest Shakespeare collection, the Folger is a place where curiosity and creativity are embraced and conversation is always encouraged. Visitors to the Folger can choose how they want to experience the arts and humanities, from interactive exhibitions to captivating performances, and from pathbreaking research to transformative educational programming.

Project Gutenberg is an online library of more than 75,000 free eBooks.