@inbook{200,
  author = {C.R Duguay and D.A Walker},
  editor = {M.F Goodchild},
  title = {Environmental modeling and monitoring with GIS: Niwot Ridge Long-Term Ecological Research site},
  year = {1996},
  pages = {219-223},
  publisher = {GIS World Publishing},
  url = {http://www.geobotany.org/library/pubs/DuguayCR1994_pgisem_2_1.pdf},
}