31 C.F.R. § 359.4 In what form are Series I savings bonds issued?
Title 31 - Money and Finance: Treasury
Series I savings bonds are issued in either book-entry or definitive form.
Title 31: Money and Finance: Treasury
PART 359—OFFERING OF UNITED STATES SAVINGS BONDS, SERIES I
Subpart A—General Information
§ 359.4 In what form are Series I savings bonds issued?