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There are significant differences between the 2nd edition study guide and the 3d edition study guide. The CWNA exam was re-written between the 2nd and the 3d editions, and the 3d edition study guide is targetted towards the new objectives. The 2nd edition study guide is targetted towards a test that doesn't exist anymore. The information in the 2nd edition study guide is still useful, but it doesn't cover many new topics that are covered in the 3d edition study guide and the current CWNA exam.

Unfortunately, you will probably want to buy the 3d edition study guide.