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Interpreting surveys to estimate the size of the monarch butterfly population: Pitfalls and prospects
- John M. Pleasants,
- Myron P. Zalucki,
- Karen S. Oberhauser,
- Lincoln P. Brower,
- Orley R. Taylor,
- Wayne E. Thogmartin
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- Published: July 14, 2017
- https://doi.org/10.1371/journal.pone.0181245