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References

Tuesday, January 5, 2016

 

U.S. Department of Transportation (USDOT). Bureau of Transportation Statistics (BTS):
 
—2016. Transportation Statistics Annual Report (forthcoming). Will be made available at http://www.bts.gov/.
—2015a. National Transportation Statistics (October 2015), available at http://www.bts.gov/ as of November 2015.
—2015b. Two Decades of Change in Transportation Reflections from Transportation Statistics Annual Reports 1994–2014. (December 2015), available at http://www.bts.gov/ as of November 2015.