Which publication deals specifically with restricted mailing?

The publication that deals specifically with restricted mailing is Publication 52. This document provides comprehensive guidelines and regulations regarding mailing restrictions, including details on how to classify and handle restricted materials. Restricted mailing can pertain to items that have special handling requirements or that are subject to certain restrictions due to safety, legal, or content-based reasons.

Publication 52 serves as an essential resource for postal employees and anyone involved in mailing processes, ensuring compliance with postal regulations that govern the dispatch of items deemed to have special status. It outlines the necessary procedures, labeling, and documentation required for restricted mail, making it a critical tool for facilitating proper mail handling.

Other publications mentioned may address different aspects of postal services or may focus on topics unrelated to restricted mailing, which is why they are not the correct choice in this context.