@misc{indiciae95bf67626add,
  title = {Summary of available data from the monarch overwintering colonies in central Mexico, 1976–1991},
  author = {Erin R Zylstra and Wayne E. Thogmartin and M. Isabel Ramirez and Elise F. Zipkin},
  year = {2021},
  doi = {10.3133/ofr20201150},
  url = {https://pubs.usgs.gov/publication/ofr20201150},
  note = {Source identifier: ofr20201150}
}