This is a set of ABeka 6th grade Observing God's World books (4th edition).  The books included are student book (#157406), the answer key (#168025), a few of the quizzes and worksheets (#157457--only worksheets 11-12, 18, 21, 22 and quizzes 11-12, 17-21, 25), quiz/worksheet key (#157465), a few tests (#157422--tests 6 and 11), and the test key (#157449).  The student book has a lot of wear on the cover, tears at the top and bottom of the spine, creases, dog-earred corners.  The pages are in good condition, no writing or markings.  Thanks for your interest!  It is appreciated!!