This concise sourcebook takes the guesswork out of locating the best sources of data, a process more important than ever as the data landscape grows incresingly cluttered. Much of the most frequently used data can be found free online, and this book shows readers how to look for it with the assistance of user-friendly tools. This thoroughly annotated guide will be a boon to library staff at public libraries, high school libraries, academic libraries, and other research institutions. It offers concentrated coverage of data sources for frequently researched subjects such as agriculture, the earth sciences, econiomics, energy, political science, and transportation; the basics of data reference along with an overview of the most useful sources; Statistical datasets, and how to understand and make use of them; and much more