@article{Weigl2009,
  author    = {Engelhard Weigl},
  title     = {Alexander von Humboldt and the beginning of the environmental movement},
  journal   = {HiN : Alexander von Humboldt im Netz ; International Review for Humboldtian Studies},
  volume    = {II},
  number    = {2},
  pages     = {121 -- 127},
  doi       = {10.18443/15},
  year      = {2009},
}