- AMERICAN IRON AND STEEL INSTITUTE - [03/29/1997]
- BUILDING AND CONSTRUCTION TRADES DEPARTMENT - [04/22/1996]
- NATIONAL ROOFING CONTRACTORS ASSOCIATION - [03/15/1995]
- RESILIENT FLOOR COVERINGS INSTITUTE - [06/15/1995]
- SAFE BUILDINGS ALLIANCE - [03/13/1995]
- BUILDING AND CONSTRUCTION TRADES DEPARTMENT - [04/06/2007]
- NATIONAL ASSOCIATION OF MANUFACTURERS - [05/21/2007]
- SURFACE FINISHING INDUSTRY COUNCIL - [10/25/2006]
- AMERICAN PETROLEUM INSTITUTE - [12/09/2003]
- STEELWORKERS - [06/21/1994]
- NATIONAL MARITIME SAFETY ASSOCIATION - [07/14/2000]