- Labor & Employment Consultants, Duncansville
- Labor And Employment Relations Attorneys & Lawyers, Duncansville
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- Labor Organizations, Duncansville
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- Laboratories Medical, Duncansville
- Land Surveyor, Duncansville - Land Surveying Services
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- Lawn Mower Repair & Blade Sharpening Service, Duncansville
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- Life Insurance, Duncansville
- Liquor Stores, Duncansville
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- Long Haul Trucking Companies, Duncansville
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- Lutheran Church, Duncansville
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