- Radiator Coolant & Solvents, Cambridge - Engine Coolant
- Radio & Tv Communications Equipment Manufacturers, Cambridge
- Real Estate, Cambridge - Agent, Broker & Companies
- Real Estate Appraiser, Cambridge - Appraisal Services
- Real Estate Appraisers & Consulting Services, Cambridge
- Real Estate Attorneys & Lawyers, Cambridge
- Real Estate Management, Cambridge
- Real Estate Properties, Cambridge
- Real Estate Recreational & Resort, Cambridge
- Real Estate Services, Cambridge
- Recreational Equipment & Supplies Companies, Cambridge
- Recreational Equipment Repair & Service, Cambridge
- Recycling Drop-Off Centers, Cambridge
- Recycling Scrap & Waste Materials, Cambridge - Scrap Metal, etc
- Refrigeration & Cooling Equipment, Parts & Supplies , Cambridge - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Cambridge - Ac, Freezer, Refrigerator Repair
- Refrigerator Sales, Service & Repair, Cambridge - Fridge
- Refuse Collection & Disposal Services, Cambridge
- Rehabilitation Centers, Products & Services, Cambridge
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- Rehabilitation Specialists, Cambridge
- Rehabilitational Job Training Services, Cambridge
- Relief Organizations, Cambridge
- Religious Education, Cambridge
- Religious Organizations, Cambridge
- Rental Property Management, Cambridge
- Repair Services, Cambridge
- Residential, Cambridge
- Residential Apartments, Cambridge
- Residential Architect, Cambridge
- Residential Care Facilities, Cambridge
- Residential Construction Contractors, Cambridge - General Contractors
- Residential Landfills, Cambridge
- Restaurants/Food & Dining, Cambridge
- Retail Book Stores, Cambridge
- Retirement Communities & Home, Assisted Living & Apartments, Cambridge
- Roofing Consultants, Cambridge - Roofing Companies
- Roofing Contractors, Cambridge - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rv Parks, Cambridge
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