Background sources such as, but not limited to, dictionaries and encyclopedias provide context for your topic or even help you choose one. Researchers use them when they need:
A brief overview of a topic
Definitions of terminology
Important issues, figures, dates, and/or events for a topic
Sources for further research in the form of bibliographies
Presents a reference guide that features state-of-the-art world maps, allowing readers to compare physical, political, and regional data, with specilized maps that cover such global themes as tectonics, biodiversity, energy sources, food, and population.
A comprehensive, up-to-date atlas encompasses more than three hundred thematic maps, along with more than six hundred color photographs, illustrations, charts, and graphs, that document the world's natural and cultural wonders.
Ebooks on most subject areas. Read online or set up an account to download or print up to 30% of pages. Please close or "release" a book when you are finished. Coverage: varies.
Encyclopedia, dictionary and biographical entries from hundreds of sources for most subject areas. It includes images, diagrams, maps and photos, and audio pronunciation files and sound clips. Coverage 2000 – present.