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This set includes everything that you need to complete the delta level. The instruction manual was published in 2004, the student workbook and the test book were published in 2012. These publication dates are compatible. The student workbook and the test book pages have been removed from the perforation, however, they are complete. The student workbook also has a rip on the front cover that has been taped. 
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.