Apache web server tutorial and reference, current as of 2001-ish.
From the back cover:
Apache isn’t just the #1 Web server—it’s also the backbone for the world’s leading e-commerce sites. In this comprehensive guide, Apache expert Scott Hawkins covers every aspect of configuring, administering, customizing, and troubleshooting Apache Server—and then demonstrates how to build powerful e-commerce applications based on PHP and MySQL, the leading open source scripting and database solutions!