I’m excited by these numbers. They’re great numbers for the world of publishing for libraries. They also confirm that you don’t publish for the library market for the money 
Using the Internet as a Reference Tool (nine years of sales) – 2850 copies
Using MS Outlook (seven years of sales) – 1100 copies
Directory of Mgt Software for Public Access Computers (seven years of sales) – 630 copies
XHTML & CSS Essentials (five years of sales) – 980 copies
Searching 2.0 (one year of sales) – 1,460 copies
