[Code of Federal Regulations] [Title 24, Volume 1] [Revised as of April 1, 2006] From the U.S. Government Printing Office via GPO Access [CITE: 24CFR81.91] [Page 469] TITLE 24--HOUSING AND URBAN DEVELOPMENT PART 81_THE SECRETARY OF HUD'S REGULATION OF THE FEDERAL NATIONAL MORTGAGE ASSOCIATION (FANNIE MAE) AND THE FEDERAL HOME LOAN MORTGAGE CORPORATION (FREDDIE MAC)--Table of Contents Subpart H_Book-Entry Procedures Sec. 81.91 Maintenance of GSE Securities. Source: 61 FR 63948, Dec. 2, 1996, unless otherwise noted. A GSE Security may be maintained in the form of a Definitive GSE Security or a Book-entry GSE Security. A Book-entry GSE Security shall be maintained in the Book-entry System.