---
kind: "unit"
title: "42"
title_heading: "Public Health"
key: "chI/subchA/part4"
level: "part"
label: "Part 4"
heading: "National Library of Medicine"
release: "ecfr-current"
date: "2026-08-27"
url: "https://uscodex.org/cfr/42/chI-subchA-part4"
sections_count: 8
---

# Part 4 — National Library of Medicine

Title 42 C.F.R. — Public Health › Chapter I — Public Health Service, Department of Health and Human Services › Subchapter A — General Provisions

## Sections

- [§4.1. Programs to which these regulations apply.](/cfr/42/4.1.md)
- [§4.2. Definitions.](/cfr/42/4.2.md)
- [§4.3. Purpose of the Library.](/cfr/42/4.3.md)
- [§4.4. Use of Library facilities.](/cfr/42/4.4.md)
- [§4.5. Use of materials from the collections.](/cfr/42/4.5.md)
- [§4.6. Reference, bibliographic, reproduction, and consultation services.](/cfr/42/4.6.md)
- [§4.7. Fees.](/cfr/42/4.7.md)
- [§4.8. Publication of the Library and information about the Library.](/cfr/42/4.8.md)