〈Product〉 ・Introduction to Information Networks - Technologies and Theories of Networks and Security - Corona Publishing 〈About the Product Condition〉 ・Used for the past few years. Stored in a dark place. ・The cover has stains, scratches, tears, etc. due to use and aging (photos 1 and 2). There is almost no other soiling, and I think it is in relatively good condition. (There is a fold in the circled area in photo 5.) ・I didn't see any writing, but there is a possibility that there may be some. ・Please let me know if you do not need the cover. ・Please refrain from purchasing if you are concerned about the above. 〈About Shipping and Packaging〉 ・We plan to ship via Yu-Yu Mercari Bin or Rakuraku Mercari Bin. ・We plan to package it in a bag to prevent water damage. ・If you have any preferred shipping or packaging methods, please consult with us before purchasing. 〈Other〉 ・Please purchase only if you understand the above. ・Please feel free to ask if you have any questions.