- Halldin Public Relations
- Company profile with information on offered marketing and public relations services.
- Harrington Communications, LLC
- Develops and implements communications strategies for various companies.
- Haslimann Taylor
- Offers services for PR audit, consultancy, media training, creative solutions, and media relations needs.
- Hass MS&L
- Specializes in public relations, PR technology, and media research.
- High Road Communications
- PR firm dedicated to assisting technology, consumer and telecommunications companies expand their business.
- High-Tech Public Relations
- Offers public relations and marketing consultation services for high-technology products and companies.
- HighWater Group
- Official website of the company presenting details on its various public relations services.
- Hilary Kaye Associates, Inc.
- Site contains company profile with information on offered public relations and marketing communications services.
- Hill and Knowlton
- Full-service consultancy for public relations and public affairs.
- Hill and Knowlton Canada
- Offers public relations, public affairs and strategic communications services.
- Hoffman and Hoffman Worldwide
- Solutions and services for global media and public relations needs.
- Hogarth
- Brief history of the company with information on services centered on strategic communications.
- Horizons Communications
- Company homepage featuring information on offered services related to public relations and marketing needs.
- Horn Group
- Assists technology companies through information and marketing.
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