Item sets

• Cooperative Engineer volumes 1-4
• Cooperative Engineer volumes 5-8
• Cooperative Engineer volumes 9-12
• Cooperative Engineer volumes 13-16
• Cooperative Engineer volumes 17-20
• Cooperative Engineer volumes 21-24
• Cooperative Engineer volumes 25-28
• Cooperative Engineer volumes 49-52
• Cooperative Engineer volumes 45-48
• Cooperative Engineer volumes 29-32
• Cooperative Engineer volumes 33-36
• Cooperative Engineer volumes 37-40
• Cooperative Engineer volumes 41-44