HBR 20 Minute Manager Book Set

10 books are in this set. See pics for subject matter. 4 books have a small check mark on the top right hand corner, 2 books have a small check mark on the top right hand corner of the first page and 4 books have no marks at all. The only marking on these books are the check marks, they are very clean. Disclosing the check marks so that you are not surprised! Thanks for looking!