The Census Atlas of the United States “is a large-format publication about 300 pages long and containing almost 800 maps. Data from decennial censuses prior to 2000 support nearly 150 maps and figures, providing context and an historical perspective for many of the topics presented.” While you can order a hardcover version for $165, the atlas is also available online for download, chapter by chapter, as PDFs. Great stuff. Press release, All Points Blog, COMPASS.