a url to the ebook that actually works

tom-howard · Mar 14, 2024 · 4435894 · 4435894
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diff --git a/docs/about/robots.md b/docs/about/robots.md
@@ -10,7 +10,7 @@ To teach ROS here we use the [TurtleBot3 Waffle](https://emanual.robotis.com/doc
 
 ### The (Free) TurtleBot3 eBook {#ebook}
 
-The TurtleBot3 Waffle developers (Robotis) have written a book on programming robots with ROS. This is available as a *free eBook*, which you can [download here](https://emanual.robotis.com/docs/en/platform/turtlebot3/learn/#books), and we recommend that you do so! This is a great resource which provides a detailed introduction to what ROS is and how it works, as well as a comprehensive "Beginners Guide" to ROS programming. The other great thing about this is that it is tailored to the TurtleBot3 Robot specifically, providing examples of how to use a range of TurtleBot3 packages along with a detailed description of how they work.
+The TurtleBot3 Waffle developers (Robotis) have written a book on programming robots with ROS. This is available as a *free eBook*, which you can [download here](https://www.pishrobot.com/wp-content/uploads/2021/05/ros-robot-programming-book-by-turtlebo3-developers-en.pdf), and we recommend that you do so! This is a great resource which provides a detailed introduction to what ROS is and how it works, as well as a comprehensive "Beginners Guide" to ROS programming. The other great thing about this is that it is tailored to the TurtleBot3 Robot specifically, providing examples of how to use a range of TurtleBot3 packages along with a detailed description of how they work.
 
 We recommend that you have a look at this book to learn more about the concepts that you are exploring in this course.