These are not the official versions, though taken from the congressional released pdf. For the official version see the proper government site, or other authorized supplier.
In the below bolded section in Historical and Revision Notes, take due Notice that the national bank currency has been supplanted by Federal Reserve Notes[promissory notes]. For further explanation see the Expose' briefings in their expansive discussions of money, currency, Federal Reserve, and other related aspects.
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18 USC Sec. 8 01/22/02
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TITLE 18 - CRIMES AND CRIMINAL PROCEDURE
PART I - CRIMES
CHAPTER 1 - GENERAL PROVISIONS
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Sec. 8. Obligation or other security of the United States defined
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The term ''obligation or other security of the United States'' includes all bonds, certificates of indebtedness, national bank currency, Federal Reserve notes, Federal Reserve bank notes, coupons, United States notes, Treasury notes, gold certificates, silver certificates, fractional notes, certificates of deposit, bills, checks, or drafts for money, drawn by or upon authorized officers of the United States, stamps and other representatives of value, of whatever denomination, issued under any Act of Congress, and canceled United States stamps.
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(June 25, 1948, ch. 645, 62 Stat. 685.)
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HISTORICAL AND REVISION NOTES
Based on title 18, U.S.C., 1940 ed., Sec. 261 (Mar. 4, 1909, ch. 321, Sec. 147, 35 Stat. 1115; Jan. 27, 1938, ch. 10, Sec. 3, 52 Stat. 7).
The terms of this section were general enough to justify its inclusion in this chapter rather than retaining it in the chapter on ''Counterfeiting'' where the terms which it specifically defines are set out in sections 471-476, 478, 481, 483, 492, and 504 of this title.
Words ''Federal Reserve notes, Federal Reserve bank notes'' were inserted before ''coupons'' because such notes have almost supplanted national bank currency.
Minor changes were made in phraseology.
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SECTION REFERRED TO IN OTHER SECTIONS
This section is referred to in title 7 section 2024; title 49
section 80302.