Department of Labor See some of their publications below:

• Occupational Outlook Handbook
• O*NET: the online service that helps you find out what skills each occupation requires. It replaces the Dictionary of Occupation Titles (DOT).
From Information Technology Associates, here are indexes to the DOT and the SIC:
• Dictionary of Occupational Titles
• Standard Industrial Classifications (SIC) Index
• Wage Determinations OnLine: Allows federal contracting officers to make wage determinations on federal contracts.
• OSHA Laws and Regulations

Occupational Employment Statistics from the Bureau of Labor Statistics. Occupational categories and wage estimates at the national, state and metropolitan levels.

More Labor Links from the Winona State University Library.