The North American Industry Classification System (NAICS) is the standard used by Federal statistical agencies in classifying business establishments for the purpose of collecting, analyzing, and publishing statistical data related to the U.S. business economy.
The International Monetary Fund's eLibrary provides access to periodicals, books, working papers and studies, and data and statistical tools across a wide range of subjects in globalization, development, emerging markets, demographics and more.
The United Nations Conference on Trade and Development keeps an online archive where you can access reports (such as the Trade and Development Report and World Investment Report), policy briefs, and minutes
The Hathitrust Digital Library has thousands of digitized books that are now out of copyright. These are all full text searchable. Easy to use and an excellent resource for a scholar doing historical research.
The website provides a fully searchable index of websites that offer access to historical collections in digital format. Includes access to various types of media and content, including video, pictures and audio files.