TY - RPRT TI - USA National Phenology Network’s volunteer-contributed observations yield predictive models of phenological transitions AU - Theresa M. Crimmins AU - Michael A. Crimmins AU - Katherine L. Gerst AU - Alyssa H. Rosemartin AU - Jake Weltzin PY - 2017 DO - 10.1371/journal.pone.0182919 UR - https://pubs.usgs.gov/publication/70190664 ID - 70190664 ER -