WorldCat is the world's largest network of library content and collections. You can use WorldCat to determine citations for books, journals, and other media, locate a copy near you, and even request a copy for delivery.
Use Google Scholar to search for scholarly literature. Once you have a citation you can request it through Interlibrary Loan at your local library. You can use Google Books to preview books you are interested in before requesting them.
The Central Intelligence Agency's annual World Factbook provides a reliable resource for information on independent states, dependencies, areas of special sovereignty, uninhabitable regions, and oceans.
The INASP provides a directory of free and open access online resources. Coverage includes the following disciplines: agriculture, biology & life science, chemistry, earth sciences, engineering & technology, environment, humanities, information & communication technologies, mathematics & statistics, medicine & health sciences, physics, and social sciences.