Review, analyze, and interpret legislation, appropriation language, directives, and Treasury Department and IRS guidelines pertaining to domestic and foreign matters such as fellowships, government travel and contracting, visas and taxes for non-resident aliens. It is the nations oldest federal cultural institution and the worlds largest library, with more than 158 million items in its physical collections (including books, manuscripts, prints, photos, film, video, and sound recordings) and over 37 million items online.