Lightning 7-volume set This is a special feature that explains everything about denim. ・Denim Style Book Vol. 9 ・Denim Style Book 2 Vol. 28 ・Denim Indigo Master Vol. 47 ・THE DENIM BOOK Vol. 62 ・The Denim Life Vol. 114 ・Feature: Denim Golden Age. Vol. 198 ・Feature: Denim Fading Encyclopedia. Vol. 206 How about this for those who want to learn about replicas and vintage Levi's? I think you'll become quite knowledgeable if you read them all. It will also be helpful for selecting vintage jeans on Mercari. All of these were purchased from used bookstores and bookstores. They have been used to some extent, but there doesn't seem to be any noticeable damage.