For readers who study archives, transportation history, and material culture, this is a treasure of method and example. The pairing of lab-style analysis with practitioner interviews will land well with map librarians, records managers, and conservation students.
Content notes: mentions of iron-gall corrosion, light discussion of workplace risk, no graphic material. Suitable for advanced high school and up, and a strong pick for collections focused on infrastructure, book history, and public memory.