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Title: The Environment in Henry David Thoreau's Walden, Author: Gary Wiener
Title: The Anthropocene: The Human Era and How It Shapes Our Planet, Author: Christian Schwägerl
Title: Animal: The Definitive Visual Guide, 3rd Edition, Author: DK
Title: Tributary Voices: Literary and Rhetorical Exploration of the Colorado River, Author: Paul A. Formisano