Trail User Surveys: Administrative Manual. Crump, C. E., Long, J., & Pein, W. E. Technical Report UNC Highway Safety Research Center, 1998, 1998.
bibtex   
@techreport{RN713,
   author = {Crump, C. E. and Long, J. and Pein, Wayne E.},
   title = {Trail User Surveys: Administrative Manual},
   institution = {UNC Highway Safety Research Center},
   month = {1998},
   year = {1998},
   type = {Report}
}
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