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Sources for Philadelphia trade figures

Union application windows come from the union's own site, and some also from the 2026 City Council Apprenticeship Guidebook. School costs come from the school's own site. Graduation and earnings for many schools come from the U.S. College Scorecard. A number a school reports about itself is labeled school-reported.

Day-on-the-job facts come from the BLS Occupational Outlook Handbook. Work likes and conditions come from O*NET OnLine and BLS. Videos are the official CareerOneStop career videos on YouTube.

Open Source on a figure to see the page it came from and the day we last checked it.