2021 | Adam Sowards, An Open Pit Visible from the Moon: The Wilderness Act and the Fight to Protect Miners Ridge and the Public Interest (University of Oklahoma Press, 2020)

2020 | Bathsheba Demuth, Floating Coast: An Environmental History of the Bering Strait (W.W. Norton, 2019)

2019 | James E. Sherow, The Chisholm Trail: Joseph McCoy’s Great Gamble (University of Oklahoma Press, 2018)

2018 | Terence Young for Heading Out: A History of American Camping (Cornell University Press, 2017)

2017 | Frederick Brown for The City is More Than Human: An Animal History of Seattle (University of Washington Press, 2016).

2015 | Andrew Needham for Power Lines: Phoenix and the Making of the Modern Southwest (Princeton University Press, 2014). 

2013 | Lissa K. Wadewitz for The Nature of Borders: Salmon, Boundaries, and Bandits on the Salish Sea (University of Washington Press, 2012). 

2012 | Brian Frehner for Finding Oil: The Nature of Petroleum Geology, 1859-1920 (University of Nebraska Press, 2011). 

2011 | Marsha Weisiger for Dreaming of Sheep in Navajo Country (University of Washington Press, 2011). 

2009 | Richard A. Walker for The Country in the City: The Greening of the San Francisco Bay Area (University of Washington Press, 2008).

2007 | Robert Righter for The Battle Over Hetch Hetchy: America's Most Controversial Dam and the Birth of Modern Environmentalism (Oxford University Press, 2006). 

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