The New York Times offers wealth of statistics on used book market and its relationship with the Internet. Book Industry Group says that used books accounted for $600 mln, or 3%, of the $21 bln that Americans spent on books in 2004. The market for used textbooks estimated at $1.6 bln, or more than 30% of the $5.3 bln spent by consumers on educational and professional books. Used-book purchases accounted for $2.2 bln, or 8%, of the $26.3 bln that American consumers spent in 2004 on books of all types. That total was up 11% from 2004.