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Bob B1981: Yellowstone River, Yellowstone National Park
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Bob B1981: Elk at Yellowstone National Park
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Bob B1981: Calcite Springs, Yellowstone National Park
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Bob B1981: Grand Prismatic Spring, Midway Geyser Basin, Yellowstone National Park
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Bob B1981: Black Pool, West Thumb Geyser Basin, Yellowstone National Park
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Bob B1981: Grand Canyon of Yellowstone
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Bob B1981: 45th Parallel, Yellowstone National Park
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Bob B1981: Tower Falls, Yellowstone National Park
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Bob B1981: Moose Falls, Yellowstone National Park
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Bob B1981: Lower Yellowstone Falls, Yellowstone National Park, Wyoming
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Bob B1981: Grand Canyon of Yellowstone, Wyoming
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Bob B1981: Grand Prismatic Spring, Yellowstone National Park, Wyoming
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Bob B1981: Angel Terrace, Mammoth Hot Springs, Yellowstone National Park
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Bob B1981: Elk Drinking from Gardner River, Yellowstone National Park, Wyoming
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Bob B1981: Norris Geyser Basin, Yellowstone National Park, Wyoming
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Bob B1981: Excelsior Geyser, Yellowstone National Park, Wyoming
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Bob B1981: Steamboat Geyser, Yellowstone National Park, Wyoming
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Bob B1981: Slough Creek Trail, Yellowstone NP, Wyoming
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Bob B1981: Highway from Mammoth to Norris, Yellowstone NP
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Bob B1981: Minute Geyser, Norris Geyser Basin, Yellowstone National Park
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Bob B1981: Swimming Hole, Firehole River, Yellowstone National Park
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Bob B1981: Lower Yellowstone Falls, Grand Canyon of Yellowstone
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Bob B1981: Yellowstone River Leading to Upper Yellowstone Falls
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Bob B1981: Bluebell Pool, West Thumb Geyser Basin, Yellowstone National Park
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Bob B1981: West Thumb Geyser Basin, Yellowstone National Park
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Bob B1981: Buffalo, Yellowstone National Park, Wyoming
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Bob B1981: Pronghorn Antelope, Yellowstone National Park, Wyoming
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Bob B1981: Grand Canyon of Yellowstone, Sublime Point Hike
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Bob B1981: Lower Yellowstone Falls, Brink of the Lower Falls Overlook
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Bob B1981: Lower Yellowstone Falls (in Explore)