Hello everyone!

found a "web book" by Bruno R. Preiss with the title:
"Data Structures and Algorithms with Object-Oriented
Design Patterns in Ruby".
You cannot download it or something without the permission of the author 
(see: http://www.brpreiss.com/books/opus8/copyright.html).
However you can read it online here:
http://www.brpreiss.com/books/opus8/

Greetings,
Andreas