83-11799 - Sulphur deposits at 'Bumpass Hell', the largest area of mudpots and steam vents at this national park around Lassen Peak volcano, Lassen volcanic national park, California, Usa
83-11797 - Sulphur deposits at 'Bumpass Hell', the largest area of mudpots and steam vents at this national park around Lassen Peak volcano, Lassen volcanic national park, California, Usa
83-11798 - Sulphur deposits at 'Bumpass Hell', the largest area of mudpots and steam vents at this national park around Lassen Peak volcano, Lassen volcanic national park, California, Usa