- Radio & Tv Communications Equipment Manufacturers, Houston
- Radio Stations & Broadcasting Companies, Houston
- Radiotelephone Communications, Houston
- Ready Mix Concrete, Houston - Concrete Suppliers, Dealers & Company
- Ready Mix Concrete Producers, Houston
- Real Estate, Houston - Agent, Broker & Companies
- Real Estate Appraiser, Houston - Appraisal Services
- Real Estate Appraisers & Consulting Services, Houston
- Real Estate Developers, Houston
- Real Estate Services, Houston
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- Records, Tapes, CDs - Used & Vintage, Houston
- Refuse Collection & Disposal Services, Houston
- Refuse Systems & Garbage Disposal, Houston
- Religious Organizations, Houston
- Religious Services, Houston
- Repair Services, Houston
- Residential, Houston
- Residential Apartments, Houston
- Restaurants/Food & Dining, Houston
- Roofing & Siding Materials, Equipments & Supplies, Houston - Wholesale, Manufacturers & Suppliers
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