Search for: [References = "Vankat, J.L. \(2011\). Post\-1935 changes in forest vegetation of Grand Canyon National Park, Arizona, USA\: Part 1 \- ponderosa pine forest. Forest Ecology and Management, 261\(3\), 309‑325. https\:\/\/doi.org\/10.1016\/j.foreco.2010.05.026"]