TY  - RPRT
TI  - Differential changes in the onset of spring across US National Wildlife Refuges and North American migratory bird flyways
AU  - Eric K. Waller
AU  - Theresa M. Crimmins
AU  - Jessica J. Walker
AU  - Erin E. Posthumus
AU  - Jake Weltzin
PY  - 2018
DO  - 10.1371/journal.pone.0202495
UR  - https://pubs.usgs.gov/publication/70199254
ID  - 70199254
ER  -