Assessing trends and vulnerabilities in the mutualism between whitebark pine (Pinus albicaulis) and Clark's nutcracker (Nucifraga columbiana) in national parks of the Sierra-Cascad... by Chris Ray, Regina M Rochefort, Jason I Ransom, Jonathan C B Nesmith, Sylvia A Haultain, Taza D Schaming, John R Boetsch, Mandy L Holmgren, Robert L Wilkerson, Rodney B Siegel

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