TY  - RPRT
TI  - Summary of available data from the monarch overwintering colonies in central Mexico, 1976–1991
AU  - Erin R Zylstra
AU  - Wayne E. Thogmartin
AU  - M. Isabel Ramirez
AU  - Elise F. Zipkin
PY  - 2021
DO  - 10.3133/ofr20201150
UR  - https://pubs.usgs.gov/publication/ofr20201150
ID  - ofr20201150
ER  -