USDA's National Agricultural Library is the world's largest and most accessible agricultural research library and the principal source in the United States for information about food, agriculture, and natural resources. The library's expert staff, its leadership role in information services and technology applications, its accessibility via the World Wide Web, its collection of more than 3.5 million items, and its close working relationship with Land-Grant and other agricultural libraries worldwide combine to make it the world's foremost agricultural library.