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 * [Introduction to Neural Networks with Java](http://www.heatonresearch.com/articles/series/1) -
 * [Introduction to Programming in Java](http://introcs.cs.princeton.edu/java/home/)- Robert Sedgewick and Kevin Wayne
 * [Introduction to Programming Using Java](http://math.hws.edu/javanotes/) - David J. Eck
-* [Introduction to Programming Using Java](http://math.hws.edu/javanotes/) - David J. Eck
 * [JAAS in Action](http://www.jaasbook.com/)
 * [Java Application Development on Linux by Carl Albing and Michael Schwarz (PDF)](http://www.phptr.com/content/images/013143697X/downloads/013143697X_book.pdf) (PDF)
 * [Java for the Beginning Programmer](http://www.heatonresearch.com/articles/series/15)