%0 Journal Article
%T Differential changes in the onset of spring across US National Wildlife Refuges and North American migratory bird flyways
%A Eric K. Waller
%A Erin E. Posthumus
%A Jake F. Weltzin
%A Jessica J. Walker
%A Theresa M. Crimmins
%J Archive of "PLoS ONE".
%D 2018
%R 10.1371/journal.pone.0202495
%U https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6135358/