@techreport{,
  author = {Wiggins, D. A.},
  pages = {Available: http://www.fs.fed.us/r2/projects/scp/assessments/purplemartin.pdf},
  publisher = {USDA Forest Service, Rocky Mountain Region},
  title = {Purple Martin (Progne subis): a technical conservation assessment},
  year = {2005}
} 
