This is a set of the upper and lower volumes for learning CATIA V5R13 design techniques. I am selling these because I no longer use them. By studying these three textbooks, I believe you will be able to master CATIA operations to a level where you can handle them without any problems, except for some advanced operations. *Please note that there are some notes (about 10 pages in total) in the textbooks for study purposes, so please refrain from purchasing if you are concerned about this.* Thank you for your consideration.