@book{ritchie_maguire_youngblood_2005, 
  title={Proceedings of the Symposium on Ponderosa Pine: Issues, Trends, and Management, 2004 October 18-21, Klamath Falls, OR}, 
  DOI={10.2737/psw-gtr-198}, 
  institution={U.S. Department of Agriculture, Forest Service, Pacific Southwest Research Station}, 
  author={Ritchie and Maguire and Youngblood}, 
  year={2005}
  }