- Radiator Coolant & Solvents, Douglas - Engine Coolant
- Radio Stations & Broadcasting Companies, Douglas
- Railroad, Douglas - Commuter & Passenger Transport
- Railroad & Subway Construction Contractors, Douglas
- Railroad Companies, Douglas
- Railroad Contractors, Douglas
- Ready Mix Concrete, Douglas - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Douglas
- Real Estate, Douglas - Agent, Broker & Companies
- Real Estate Agent & Broker Services, Douglas
- Real Estate Agent - Property Lessors, Douglas
- Real Estate Appraisers & Consulting Services, Douglas
- Real Estate Attorneys & Lawyers, Douglas
- Real Estate Attorneys & Lawyers, Douglas
- Real Estate Broker, Douglas
- Real Estate Consultants, Douglas
- Real Estate Developers, Douglas
- Real Estate Lawyers & Attorneys, Douglas
- Real Estate Management, Douglas
- Real Estate Properties, Douglas
- Real Estate Recreational & Resort, Douglas
- Real Estate Referral & Information Services, Douglas
- Real Estate Services, Douglas
- Records, Tapes, CDs - Used & Vintage, Douglas
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- Recycling Scrap & Waste Materials, Douglas - Scrap Metal, etc
- Refrigerated Beverage Dispenser, Douglas - Water Coolers Equipment & Supplies
- Refrigeration & Cooling Equipment, Parts & Supplies , Douglas - Water Cooler, Ice Machine, Beverage Dispenser, etc
- Refrigeration Repair & Service, Douglas - Ac, Freezer, Refrigerator Repair
- Religious Organizations, Douglas
- Repair Services, Douglas
- Research Services, Douglas
- Residential, Douglas
- Residential Apartments, Douglas
- Residential Care Facilities, Douglas
- Residential Construction Contractors, Douglas - General Contractors
- Resorts & Hotels, Douglas
- Restaurants/Food & Dining, Douglas
- Retail Book Stores, Douglas
- Retirement & Estate Planning, Douglas
- Retirement Communities & Home, Assisted Living & Apartments, Douglas
- Retirement Planning Consultants & Services, Douglas
- Riding Equipment, Douglas
- Rigging Equipment & Supplies, Douglas
- Rodeo & Equestrian Equipment & Supplies, Douglas
- Roofing Consultants, Douglas - Roofing Companies
- Roofing Contractors, Douglas - Roof Repair, Cleaning, Installation & Maintenance - Roofers
- Rv Parks, Douglas
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