- Radio Broadcasting Program Producers, Cambridge
- Radio Stations & Broadcasting Companies, Cambridge
- Radiology Equipment & Services, Cambridge - X-Ray Equipment & Supplies
- Radiotelephone Communications, Cambridge
- Range & Oven Repair, Service & Sales, Cambridge
- Rape Victim Services, Cambridge
- Real Estate, Cambridge - Agent, Broker & Companies
- Real Estate Agencies, Cambridge
- Real Estate Agent & Broker Services, Cambridge
- Real Estate Agent - Property Lessors, Cambridge
- Real Estate Appraiser, Cambridge - Appraisal Services
- Real Estate Appraisers & Consulting Services, Cambridge
- Real Estate Broker, Cambridge
- Real Estate Consultants, Cambridge
- Real Estate Developers, Cambridge
- Real Estate Investment Trusts, Cambridge
- Real Estate Management, Cambridge
- Real Estate Properties, Cambridge
- Real Estate Property Investment Properties, Cambridge
- Real Estate Rentals, Cambridge
- Real Estate Services, Cambridge
- Real Estate Support Services, Cambridge
- Record Labels, Cambridge - Record Companies
- Record Storage, Destruction & Management, Cambridge
- Records, Tapes, CDs - Used & Vintage, Cambridge
- Records, Tapes, Compact Discs Wholesale, Cambridge
- Recreational Services, Cambridge
- Recycling Scrap & Waste Materials, Cambridge - Scrap Metal, etc
- Reformed Churches, Cambridge
- Refuse Collection & Disposal, Cambridge
- Refuse Collection & Disposal Services, Cambridge
- Refuse Systems & Garbage Disposal, Cambridge
- Rehabilitation Centers, Products & Services, Cambridge
- Rehabilitation Specialists, Cambridge
- Rehabilitational Job Training Services, Cambridge
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- Relief Organizations, Cambridge
- Religious Goods & Church Supplies Stores, Cambridge
- Religious Organizations, Cambridge
- Religious Practitioners, Cambridge
- Rental & Leasing Business Equipment, Cambridge
- Repair Services, Cambridge
- Research & Development Bureaus, Cambridge - Commercial, Economic, Sociological & Educational Research
- Research & Development Engineers, Cambridge
- Research & Development Labs, Cambridge - Laboratories
- Research Services, Cambridge
- Residential, Cambridge
- Residential Apartments, Cambridge
- Residential Architect, Cambridge
- Residential Care Facilities, Cambridge
- Residential Construction Contractors, Cambridge - General Contractors
- Residential Electricians, Cambridge - Electric Contractors
- Resorts & Hotels, Cambridge
- Restaurant & Lounge, Bar, Or Pub, Cambridge
- Restaurant Equipment, Cambridge
- Restaurant Equipment & Supplies, Cambridge
- Restaurant Information & Referral Service, Cambridge
- Restaurant Management & Consulting, Cambridge - Food Facilities Consultants
- Restaurant Supplies & Equipment, Cambridge
- Restaurants - Breakfast Brunch Lunch, Cambridge
- Restaurants/Food & Dining, Cambridge
- Retail Book Stores, Cambridge
- Retirement & Estate Planning, Cambridge
- Retirement Communities & Home, Assisted Living & Apartments, Cambridge
- Retirement Planning Consultants & Services, Cambridge
- Reweavers Garment Services, Cambridge
- Rheumatologists, Cambridge - Rheumatology Doctors, Physicians & Surgeons
- Risk Management Consultants, Cambridge
- Roadside Assistance, Road Service & Towing Service, Cambridge
- Roofing Consultants, Cambridge - Roofing Companies
- Roofing Contractors, Cambridge - Roof Repair, Cleaning, Installation & Maintenance - Roofers
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