CFR›Title 31›Subtitle B›Chapter II›Part 337›Subpart B ContainsSections 337.11–337.13CorpusDaily eCFRDisplayed edition2026-04-28Last updated2026-04-28 Subpart B—Book-Entry Debentures Sections 337.11 § 337.11 Original issue and conversions. 337.12 § 337.12 Applicability of TREASURY DIRECT regulations. 337.13 § 337.13 Payment of mortgage insurance premiums. Previous A Subpart A—Certificated Debentures Next C Subpart C—Additional Information