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ASTM . 2004. Standard specification for engineered wood fiber for use as a playground safety surface under and around playground equipment , ASTM F2075-04, Vol. 15.07. West Conshohocken , PA : American Society for Testing and Materials.

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RESNA. 2000. RESNA Surface, section 1: Test method for firmness and stability. Working draft standard. Arlington , VA Rehabilitation Engineering and Assistive Technology Society of North America . 11–20. This email address is being protected from spambots. You need JavaScript enabled to view it.