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Greg Vaughn: Yellowstone geothermal pool
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Greg Vaughn: Yellowstone in winter
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Greg Vaughn: Mounded Snow
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Greg Vaughn: Old Faithful
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Greg Vaughn: Yellowstone Winter
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Greg Vaughn: Bison in Winter
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Greg Vaughn: Cottonwoods, Lamar Valley
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Greg Vaughn: One-flower Helianthella
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Greg Vaughn: Autumn Cottonwoods
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Greg Vaughn: Bison on the move
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Greg Vaughn: Grand Prismatic Spring
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Greg Vaughn: Grassy Spring
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Greg Vaughn: Undine Falls
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Greg Vaughn: Lamar Valley Cottonwood
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Greg Vaughn: Looking for Mama
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Greg Vaughn: Hayden Valley
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Greg Vaughn: Cottonwoods in Winter