So far the book seems to serve its purpose. It seems though that there could always be more information, more details for 6th graders. In the previous review of 2013 by someone else, it appears as though the information has been corrected at least in the 2008 version that I am viewing; pictures, diagrams, and other visuals are helpful additions to explanations. Thanks for early delivery. Hardcover Publisher: Macmillan/ McGraw-Hill; 1 edition (2011) Language: English ISBN-10: 0022880119 ISBN-13: 978-0022880118 Product Dimensions: 9.1 x 1.4 x 10.9 inches Link Download http://nitroflare.com/view/BBBDF2DE57BD282/https://nitroflare.com/folder/949760/L00VuZ2xpc2g=