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Thermal algae
Algae
Thermal algae
Algae
Thermal algae
Algae
Thermal algae
Algae
Filamentous bacteria in Palette Spring at Mammoth Hot Springs
Bacterium
Green algae flow in Norris Geyser Basin
Algae
Algae in thermal water
Algae
Algae in thermal water
Algae
Algae in thermal water
Algae
Algae in thermal water
Algae
Algae in thermal water
Algae
Algae in thermal water
Algae
Algae in thermal water
Algae
Algae in thermal water
Algae
Algae in thermal water
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Algae in thermal water
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Algae in thermal water
Algae
Algae in thermal water
Algae
Algae in thermal water
Algae
Algae mat
Algae
Algae & bacteria at Fountain Paint Pots
Algae, Bacterium
Filamentous bacteria & algae in the Upper Geyser Basin
Algae, Bacterium
Algae & filamentous bacteria at Mammoth Hot Springs
Algae, Bacterium
Algae growth in hot spring in the Old Faithful area
Algae
Algae in pool at West Thumb
Algae
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