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Melanie and Mary at Mushroom Spring, 2004.Michael Kuhl and Andrea Wieland at Mushroom Spring, late 1990's.Michael Kuhl and Andrea Wieland at Mushroom Spring, late 1990's.Mike Ferris and Dave at Octopus Spring, 1994.Alyson Ruff-Roberts, Gjis Kuenen, Eric Kopczynski, and Dave at Clearwater Spring, early 1990's.Alyson Ruff-Roberts at Octopus Spring, early 1990's.Roland Weller at Octopus Spring, mid-1980's.Niels Peter Revsbech doing microsensor analysis at Octopus Spring, early 1980's.Kent Kremmerling near upper temperature limit of cyanobacterial mat, Firehole Lake Loop Road area, late 1970's.Ken Sandbeck at a hot spring near Yellowstone Lake, late 1970's.

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