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- [13] Consultant buyers guide and directory survey EM: Air & Waste Management Association's Magazine for Environmental Managers, 1998,
- [17] 2003 Annual Buyers Guide and Editorial Directory WEM-WATER ENGINEERING & MANAGEMENT, 2002, 149 (12): : 21 - +
- [18] Buyers' Guide Edition Laboratory Internet Directory American Biotechnology Laboratory, 16 (02):