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Uncle Fed's Taxes: Tax Topic 401, Wages and Salaries
This site from Uncle Fed's Tax board explains withholding tax from wages and salaries. Mentions various forms that are used when filing taxes.
Other
Awesome Library: Wage Considerations
This resource page links to articles and calculators for understanding the minimum wage and other salary considerations in economy that affect how much people are paid.
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Salary: Salary Wizard
What are you worth? Provides salary range for professions by location within the United States.