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https://www.fs.usda.gov/treesearch/content/pdf?name=Cronartium%20ribicola%20resistance%20in%20whitebark%20pine,%20southwestern%20white%20pine,%20limber%20pine%20and%20Rocky%20Mountain%20bristlecone%20pine%20-%20preliminary%20screening%20results%20from%20first%20tests%20at%20Dorena%20GRC