Work cat.: 2017444645: Monedas, billetes y medallas del Estado de México, 2014 ([cataloger's translation] Coins, bills and medals of the State of Mexico)

American heritage dictionary of the English language, via WWW, viewed Nov. 16, 2017 (bill¹ n. 5.a. A piece of legal paper money: [as in] a ten-dollar bill)

Merriam-Webster unabridged, via WWW, viewed Nov. 16, 2017 (paper money, noun (1) or paper currency: paper documents that circulate instead of metallic money: such as (a): paper forms issued for the purpose of circulation as money (such as government notes and banknotes); (b): paper instruments (such as checks and negotiable drafts) that have the effect of replacing money in circulation)

Villalobos Acosta, C. Arqueología en circulación, 2020: p. 4 of cover (the author analyzes in detail national products of mass circulation, among them the iconography imprinted on coins, bank notes, and postage stamps) (DLC)2022377392

Merriam-Webster, via WWW, viewed May 23, 2022 (numismatics, noun: the study or collection of coins, tokens, and paper money and sometimes related objects (such as medals) [example] An area of numismatics that has increased in popularity and value is paper money.-- Quoc Nguyen)

The curse of cash.