Central PA Internships
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FalconJobs is now MC CareerPro . Internship and Job postings may be found there.
Internship-Specific Search Engines
General Search Engines
Large Local Organizations with Multiple Opportunities
Pennsylvania Dept. of Labor & Industry - Job Gateway
Pennsylvania State Civil Service Commission
In the search field type "internship"
Philadelphia Film Office
Summer Research Opportunities in the Life Sciences
Washington Internship Institute - http://wiidc.org/