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LAVA TUBES OF ICELAND
The 10th International Symposium of Vulcanospeleology
Reykjavík, Iceland, September 2000.
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LAVA TUBES OF KOREA
The 13th International Symposium of Vulcanospeleology
Jeju Island, Korea, September 2008.
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LAVA TUBES OF NEW MEXICO
Photos from Harry's five-year mapping project of lava tubes of the Zuni-Bandera Volcanic Field, New Mexico.
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LAVA TUBES OF WASHINGTON
The 2006 National Speleological Society Convention
Bellingham, Washington
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CARLSBAD CAVERNS
Vertical caving in the Slaughter Canyon backcountry of Carlsbad Caverns, New Mexico.
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GYPSUM KARST PROJECT (GypKaP)
Caving in UFO country near Roswell, New Mexico, in the infamous stream tunnels of Gypkap, New Mexico.
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NSS CONVENTION 2000
The 2000 National Speleological Society Convention
Old Timer's Reunion site in Dailey, West Virginia.
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NSS CONVENTION 2005
The 2005 National Speleological Society Convention
TAG country (Tennessee, Alabama, Georgia).
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NSS CONVENTION 2006
The 2006 National Speleological Society Convention
Bellingham, Washington
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NSS CONVENTION 2007
The 2007 National Speleological Society Convention
Marengo, Indiana.
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CAVE DIVING
Cave diving in the Riviera Maya
Tulum, Mexico.
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