http://superfill.net/2008/08/hazard-assessment-of-recycled-tire-crumb-infill-sprague-field-task-force/
http://www.sfgate.com/cgi-bin/article/article?f=/c/a/2008/09/03/BAK012MTOM.DTL
http://cahe.nmsu.edu/programs/turf/documents/brigham-young-study.pdf
Saturday, October 4, 2008
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