Bing found the following results
The Seven Denominations | U.S. Currency Education Program
American money | USAGov
The U.S. Dollar: Definition, Symbols, Denomination, Currency
United States dollar - Wikipedia
Identifying Banknotes | U.S. Currency Education Program
Banknotes of the United States dollar - Wikipedia
Which denominations of currency does the Federal Reserve issue?
Large denominations of United States currency - Wikipedia
United States Dollar (USD) - Overview, History, Denominations