- Radon Testing & Services, Peterborough
- Ready Mix Concrete, Peterborough - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Peterborough
- Real Estate, Peterborough - Agent, Broker & Companies
- Real Estate Appraiser, Peterborough - Appraisal Services
- Real Estate Appraisers & Consulting Services, Peterborough
- Real Estate Management, Peterborough
- Real Estate Services, Peterborough
- Recreational Organizations, Peterborough
- Rehabilitation Centers, Products & Services, Peterborough
- Rehabilitation Specialists, Peterborough
- Religious Organizations, Peterborough
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- Religious Practitioners, Peterborough
- Repair Services, Peterborough
- Research & Development Bureaus, Peterborough - Commercial, Economic, Sociological & Educational Research
- Research Services, Peterborough
- Residential, Peterborough
- Residential Apartments, Peterborough
- Residential Construction Contractors, Peterborough - General Contractors
- Restaurant Management & Consulting, Peterborough - Food Facilities Consultants
- Restaurants/Food & Dining, Peterborough
- Retirement Communities & Home, Assisted Living & Apartments, Peterborough
- Road Construction, Peterborough - Companies & Contractors
- Road Construction & Repair Contractors, Peterborough
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