The largest library in the world, with millions of books, recordings, photographs, newspapers, maps and manuscripts in its collections. The Library is the main research arm of the U.S. Congress and the home of the U.S. Copyright Office.

Database of the riches held within America’s libraries, archives, museums, and other cultural heritage institutions. All of the materials found through DPLA—photographs, books, maps, news footage, oral histories, personal letters, museum objects, artwork, government documents, and so much more—are free and immediately available in digital format.

Helps you find relevant work across the world of scholarly research You can search across many disciplines and sources: articles, theses, books, abstracts and court opinions, from academic publishers, professional societies, online repositories, universities and other web sites.

BASE is one of the world's most voluminous search engines especially for academic web resources. BASE provides more than 240 million documents from more than 8,000 content providers. You can access the full texts of about 60% of the indexed documents for free (Open Access). BASE is operated by Bielefeld University Library.

Aggregate open access content currently distributed across a variety of journals and repositories. This includes hundreds of millions of research papers from nearly 10,000 data providers in 145 countries. Users can access CORE’s information free of charge.

Semantic Scholar is a free, AI-powered research tool for scientific literature, based at the Allen Institute for AI. Semantic Scholar collaborates with industry partners to achieve their mission of timely, open access to relevant scientific research. Their growing list of partners includes IEEE, Microsoft Academic, Springer Nature, and more than 500 other publishers, university presses, and scholarly societies around the world.

A collection of historical documents organized by time period and topic. A great resource for primary source documents.

100 milestone documents of American history, from 1776 to 1965. Includes transcripts and large images including the Constitution, the Declaration of Independence, the Bill of Rights, the Emancipation Proclamation, a Letter from Jackie Robinson, and more.

More than 80 controversial issues from gun control and death penalty, to immigration and alternative energy organized and archived by professional researchers with rigorous editorial standards.

Open access website that houses 700+ peer-reviewed clinical, medical, life sciences, engineering, and management journals.

A weekly international journal publishing the finest peer-reviewed research in all fields of science and technology on the basis of its originality, importance, interdisciplinary interest, timeliness, accessibility, elegance and surprising conclusions.

A gateway to U.S. government science information. The portal offers free access to research and development (R&D) results and scientific and technical information from scientific organizations across 13 federal agencies. Users can search over 60 databases, over 2,200 websites, and over 200 million pages of authoritative federal science information in many formats, including full-text documents, citations, scientific data supporting federally funded research, and multimedia.

An online encyclopedia with over 120,000 articles that are updated regularly.