Beginning JSP 2.0 by Galbraith et al. Wrox Press February 2003 - Chapters 15 and 16 cover web development using Struts.
Sams Teach Yourself Java Server Pages in 21 Days by Steve Holzner, September 2002 - Day 19 is Struts day.
Mastering Tomcat Development by Ian McFarland and Peter Harrison, November 2002 - Chapter 13 covers doing MVC with Struts.
MySQL and JSP Web Applications: Data-Driven Programming Using Tomcat and MySQL by James Turner. March 2002. Includes a chapter on Tomcat and Struts.
JSP and Tag Libraries for Web Development - by Wellington L. S. Da Silva. January 2002. Several chapters regarding Struts.
Professional JSP Site Design - by Gabraith, Husted, Nelson, Kochmer, et al (Wrox book). November 2001. Features Struts in chapters 2 (The Struts Framework), 6 (Navigation), 8 (Data Access Patterns), 12 (Content Management), 13 (Searching), and 14 (Portals).
Beginning JSP Web Development by Falkner, Galbraith, Irani, Kochmer, Kunnumpurath, Panduranga, Perrumal, Timney (Wrox book). August 2001. One chapter focuses on an introduction to Struts 1.0 and two chapters on creating an application that uses Struts.
WebSphere Version 4 Application Development Handbook (PDF) - IBM Redbook, Chapter 7 covers designing with both the Struts and WebSphere frameworks.
Java Server Pages and J2EE Web-based Applications for Enterprises - In German, with a Chapter regarding MVC and Struts.
Core J2EE Patterns by Alur, Crupi, Malks. June 2001. Many of these patterns are deployed in Struts.
Professional JSP 2nd Edition by Wilkenson et al (Wrox book). April 2001. Long chapter on Struts.
Advanced JavaServer Pages by David Geary. May 2001. Features template tag library from Struts 1.0.
JSP, Servlets, and MySQL by David Harms, 2001 - Features a chapter on Struts 1.0.
JSP Weekend Crash Course by Andrew Utter et al, January 2001 - Struts 1.0 is last part of the Sunday afternoon lesson.