- Radiator Coolant & Solvents, Mills - Engine Coolant
- Ready Mix Concrete, Mills - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Mills
- Real Estate, Mills - Agent, Broker & Companies
- Real Estate Services, Mills
- Records, Tapes, CDs - Used & Vintage, Mills
- Recreational Services, Mills
- Recycling Drop-Off Centers, Mills
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- Recycling Scrap & Waste Materials, Mills - Scrap Metal, etc
- Repair Services, Mills
- Research Services, Mills
- Residential, Mills
- Restaurants/Food & Dining, Mills
- Roofing Consultants, Mills - Roofing Companies
- Roofing Contractors, Mills - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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