The Social Science Research Network (SSRN) "is devoted to the rapid worldwide dissemination of social science research and is composed of a number of specialized research networks in each of the social sciences."
It includes both an abstracts database (over 345,000 items) and a collection of full text papers (280,000). SSRN Networks include free and fee-based journals in 13 subject areas ranging from accounting to rhetoric.
New since 2011, GigaScience is an international journal published by BioMed Central. Co-published also by BGI Shenzhen (Beijing Genomics Institute: one of the world's largest data-producing and analysis centers), GigaScience produces articles relating to biological and biomedical "big-data" studies.
Visit the Digital Collections and Services gateway at the Library of Congress to locate digital photographs, sound recordings, manuscripts, books, maps, and other materials. Includes historical newspapers and veterans items too.
Explore digital collections around the world and investigate exciting opportunities for research in the Global Gateway at the Library of Congress. Includes also multimedia such as webcasts and selected videos.
Google makes public data available through its Public Data search engine.
Search here for worldwide governmental population, demographic, employment, transportation, public health, economic, energy, education statistics, and more.