http://www.loc.gov/catdir/enhancements/fy1005/2010000034-b.html
http://www.loc.gov/catdir/enhancements/fy1005/2010000034-d.html
http://www.loc.gov/catdir/enhancements/fy1005/2010000034-t.html
http://assets.cambridge.org/97805211/10808/cover/9780521110808.jpg