STEP 1: LIMIT results to these categories:
STEP 2: Return ONLY resources from:
Select multiple by holding down [control] or [command]
published Feb 1, 2014
U.S. Access Board,
National Center on Accessibility
In 2007 the National Center on Accessibility (NCA) entered into an agreement with the U.S. Access Board and National Park Service to investigate natural firm and stable surface alternatives when creating accessible pedestrian trails, including crushed stones, packed soil, and other natural material.
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