CFR›Title 27›Chapter I›Part 18›Subpart C›Subject Group Document Requirements ContainsSections 18.17–18.19CorpusDaily eCFRDisplayed edition2026-04-24Last updated2026-04-24 Sections 18.17 § 18.17 Retention of documents. 18.18 § 18.18 Execution under penalties of perjury. 18.19 § 18.19 Security. Previous 18.16 § 18.16 Forms prescribed.