Free Social Sciences Books : Statistics
A Census that Mirrors America: Interim Report by National Research Council Committee on National Statistics (page images at NAP)
Counting People in the Information Age, ed. by Duane L. Steffey and Norman M. Bradburn (page images at NAP)
Modernizing the U.S. Census, ed. by Barry Edmonston and Charles Schultze (frame-dependent HTML and images at NAP)
Principles and Practices for a Federal Statistical Agency, ed. by Margaret E. Martin (page images at NAP)