Dean Gulstad:
Mud Caldron
Dean Gulstad:
Mud Volcano
Dean Gulstad:
Mud Volcano
Dean Gulstad:
Dragon's Mouth Spring overflow pool
Dean Gulstad:
Dragon's Mouth
Dean Gulstad:
Hot spring pool
Dean Gulstad:
Hot spring pools
Dean Gulstad:
Hot spring pools
Dean Gulstad:
Mud Volcano Area
Dean Gulstad:
Roaring Mountain
Dean Gulstad:
Canary Spring
Dean Gulstad:
Canary Spring
Dean Gulstad:
Canary Spring
Dean Gulstad:
Canary Spring
Dean Gulstad:
Thermophiles
Dean Gulstad:
Main Terrace
Dean Gulstad:
Main Terrace
Dean Gulstad:
Main Terrace feeder
Dean Gulstad:
Main Terrace
Dean Gulstad:
Fresh travertine terraces
Dean Gulstad:
Fresh travertine terraces
Dean Gulstad:
Travertine
Dean Gulstad:
Mound Terrace
Dean Gulstad:
Screaming Mouth
Dean Gulstad:
Mound Terrace
Dean Gulstad:
Minerva Terrace
Dean Gulstad:
Jupiter Terrace
Dean Gulstad:
Mammoth Hot Springs from a distance
Dean Gulstad:
Grand Prismatic Spring
Dean Gulstad:
Sinter terraces
