TY - RPRT TI - Influences of the El NiƱo Southern Oscillation and the Pacific Decadal Oscillation on the timing of the North American spring AU - Gregory J. McCabe AU - Toby R. Ault AU - Benjamin I. Cook AU - Julio L. Betancourt AU - Mark D. Schwartz PY - 2011 DO - 10.1002/joc.3400 UR - https://pubs.usgs.gov/publication/70189252 ID - 70189252 ER -