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Willem van Leeuwen, a UA professor of natural resources and the environment, measures snowpack in a "snow pit" along Arizona's Mogollon Rim during a snow survey in 2017.	(Photo: Patrick Broxton, ©2017) Willem van Leeuwen, a UA professor of natural resources and the environment, measures snowpack in a "snow pit" along Arizona's Mogollon Rim during a snow survey in 2017.