https://www.law.cornell.edu/supct/html/90-118.ZO.html
United States v. Alaska, 503 U.S. 569 (1992).
503 u sunited statesvalaska569
https://www.dol.gov/agencies/ofccp/section-503?lang=vi
Section 503 | U.S. Department of Labor
Section 503 of the Rehabilitation Act of 1973 is a law that prohibits federal contractors and subcontractors from discriminating in employment against...
503 u sdepartment ofsectionlabor
https://www.copyright.gov/newsnet/2013/503.html
NewsNet Issue 503 | U.S. Copyright Office
Congressman Goodlatte Addresses Creators and Copyright Office at World IP Day Event
503 u snewsnetissuecopyrightoffice