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Greenback: Definition, Origin, and History - Investopedia
Greenback movement | Civil War, Currency & Inflation | Britannica …
What are Greenbacks? | U.S. Dollar | APMEX
Greenback: Definition, Origin, and History | LiveWell
Why a stronger dollar is dangerous - The Economist
Greenback | Encyclopedia.com
Greenbacks | Encyclopedia.com
Greenback (1860s money) - Wikipedia
Definition of Greenbacks - ThoughtCo
Greenback | Museum of American Finance - MoAF