The Sierra Group

The Sierra Group is also listed under the following categories: Standard Yellow Pages Heading (SYPH) Categories:

• Engineers Consulting
• Public Relations Counselors

North American Industry Classification System (NAICS) Categories:

• Engineering Services > Engineers Consulting
• Public Relations Agencies > Public Relations Services > Public Relations Consultants

Standard Industry Classification (SIC) Categories:

• Engineering Services > Engineers Consulting
• Public Relations Services > Public Relations Firms > Public Relations Consultants