Thank you for viewing. This is an optimal set for the national examination, consisting of a 4-piece set: the Elementary Refrigeration Examination Text, the 2024 Edition Exam Questions and Explanations, an Overview of the High-Pressure Gas Safety Act, and a Collection of Refrigeration-Related Laws and Regulations. The Elementary Refrigeration Examination Text has some writing and folds, but the others are in very clean condition overall, with no writing. (Photo 10) The Elementary Refrigeration Examination Text has writing, so we are offering it at a lower price than the market average. The others are generally in good condition, but there may be minor scratches. Please refer to the photos for the condition of the items.