http://tti.tamu.edu/documents/0-6177-1.pdf
http://www.ntis.gov
http://ops.fhwa.dot.gov/perf_measurement/index.htm
http://www.profaceamerica.com/cms/site/841df35d572b686e/index.html
http://www.cdw.com/
http://www.dell.com/
http://www.profaceamerica.com/cms/resource_library/datasheets/f95da99f64744ec0/ds_154
http://www.profaceAmerica.com
http://www.dell.com/downloads/global/products/latit/en/laptop-latitude-e6400-xfr-specsheet.pdf
http://www.dell.com
http://www.digi.com
http://www.digi.com/pdf/prd_msc_digineo.pdf
http://www.cdw.com/shop/products/default.aspx?EDC=534357
http://www.cdw.com/shop/products/default.aspx?EDC=255964
http://www.digi.com/products/usb/edgeport.jsp#overview
http://www.cdw.com/shop/products/default.aspx?EDC=259264
http://www.naztec.com