 Sheltowee Trail near Chimney Top Rock. Red River Gorge, Kentucky, November 6, 1999.
 Limestone rocks, view from Sheltowee Trail near Chimney Top Rock. Red River Gorge, Kentucky, November 6, 1999.
 View of canyon walls at evening from Sheltowee Trail near Chimney Top Rock. Red River Gorge, Kentucky, November 6, 1999.
 Sheltowee Trail. Red River Gorge, Kentucky, November 6, 1999.
 Bottom of a canyon, view from Sheltowee Trail. Red River Gorge, Kentucky, November 6, 1999.
 Bamboo brushes on the bottom of a canyon near Sheltowee Trail. Red River Gorge, Kentucky, November 6, 1999.
 Erosion of a limestone rock at Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Erosion forms of limestone in a rock shelter at Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Erosion forms of limestone on a rock shelter at Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Tree roots and erosion forms on a limestone rock at Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Gray s Arch, view from rock shelters. Red River Gorge, Kentucky, November 6, 1999.
 Gray s Arch, view from rock shelters. Red River Gorge, Kentucky, November 6, 1999.
 View of rock shelters from the top of Gray s Arch. Red River Gorge, Kentucky, November 6, 1999.
 A.S. on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 A.S. on Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 View from Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Forest near Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 A small maple on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Flowers on a stone at Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 Mushrooms in moss at Buck Trail. Red River Gorge, Kentucky, November 7, 1999.
 Pine forest on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Rough Trail to Gray s Arch. Red River Gorge, Kentucky, November 5, 1999.
 Oak forest near Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 A tree with very big leaves on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Rough Trail to Gray s Arch. Red River Gorge, Kentucky, November 5, 1999.
 View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 View from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 View of a canyon from Pinch Em Tight Trail. Red River Gorge, Kentucky, November 7, 1999.
 Unknown dwarf berries on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Blueberry and rhododendron bushes on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Rhododendron in a canyon, view from Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Multicolor maple leaves on Rough Trail. Red River Gorge, Kentucky, November 6, 1999.
 Limestone erosion forms at Koomer Ridge Trail. Red River Gorge, Kentucky, November 7, 1999.
 Mushroom-like limestone erosion forms at Koomer Ridge Trail. Red River Gorge, Kentucky, November 7, 1999.
 Creeping fern among dry leaves and needles on Koomer Ridge Trail. Red River Gorge, Kentucky, November 7, 1999.
 Forest below Gray s Arch. Red River Gorge, Kentucky, November 6, 1999.
 Forest near Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
 Forest near Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
 Forest near Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
 Forest near Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
 Gray s Arch with rhododendron on foreground. Red River Gorge, Kentucky, November 6, 1999.
 Rhododendron, fir and maples near Gray s Arch. Red River Gorge, Kentucky, November 6, 1999.
 View from the top of Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
 Erosion of limestone near Gray s Arch. Red River Gorge, Kentucky, November 6, 1999.
 View from the top of Gray s Arch at morning. Red River Gorge, Kentucky, November 6, 1999.
 Tobacco farm near Slade, Kentucky, November 5, 1999.
 View of Wabash River from a trail to Fort Ouiatenon. Indiana, November 13, 1999
 Forest of Enfield gorge, from Rim Trail, in Robert H. Treman State Park. Ithaca, New York, November 2, 2005
 White fungus on Four Notch Loop Trail in Sam Houston National Forest. Huntsville, Texas, May 11, 2008
 Early snowfall on Rock Street near Museum of Fall River Historical Society in historic Highlands District. Fall River, Massachusetts, November 13, 2004
 Fallen sycamore tree in snow near Gorge Trail in Taughannock Falls State Park. New York, November 23, 2005
 Fall colors of Enfield gorge, view from Rim Trail, in Robert H. Treman State Park. Ithaca, New York, November 2, 2005
 Jelly fungus (Tremella fuciformis) mushrooms on a log on Chinquapin Trail near a dam in Huntsville State Park. Texas, October 10, 2009
 Fall colors of Enfield gorge, zoomed, view from Rim Trail, in Robert H. Treman State Park. Ithaca, New York, November 2, 2005
 Orange jelly fungus (Dacryopinax spathularia mushrooms) on a log on a dam on Chinquapin Trail in Huntsville State Park. Texas, October 10, 2009
 Fungus (mushroom) growing on dead tree on Raccoon Run Trail in Lick Creek Park. College Station, Texas, December 14, 2012
 Rock Street in historic Highlands District. Fall River, Massachusetts, November 13, 2004
 Dacryopinax spathularia mushrooms (jelly fungus) fruiting through cracks in the wood on Chinquapin Trail in Huntsville State Park. Texas, October 10, 2009
 Museum of S. I. Vavilov State Optical Institute with an old artistically decorated chimney and a Soviet-era exposition. (the room has reach interior because the building was expropriated from a wealthy family after the Great October Socialist Revolution). Vasilyevsky Island, Saint Petersburg, Russia, April 14, 1999.
 From a trail near Hogs Rock in Freetown/Fall River State Forest. Massachusetts, April 20, 2003.
 A rock in the middle of Bell Rock Road in Freetown - Fall River State Forest. Massachusetts, August 24, 2003
 A trail between Hog s Rock and Doctor s Mill Pond in Freetown/Fall River State Forest. Massachusetts, May 24, 2003
 A trail between Hog s Rock and Doctor s Mill Pond in Freetown/Fall River State Forest. Massachusetts, May 24, 2003
 Oak galls on a trail in Birch Creek Unit of Somerville Lake State Park. Texas, November 11, 2012
 A dam in Russells Mills village, on Paskamansett River, view from Rock O Dundee Road. Dartmouth, Massachusetts, November 28, 2003
 Fiddleheads on a trail between Hog s Rock and Doctor s Mill Pond in Freetown/Fall River State Forest. Massachusetts, May 24, 2003
 Exfoliating bark of river birch (Betula nigra) on Deer Run Trail in Lick Creek Park. College Station, Texas, August 28, 2008
 Accumulation of oak galls on a trail in Birch Creek Unit of Somerville Lake State Park. Texas, November 11, 2012
 A dam in Russells Mills village, on Paskamansett/Slocums River, view from Rock O Dundee Road. Dartmouth, Massachusetts, November 23, 2003
 A dam in Russells Mills village, on Paskamansett/Slocums River, view from Rock O Dundee Road. Dartmouth, Massachusetts, November 28, 2003
 A dam in Russells Mills village, on Paskamansett/Slocums River, view from Rock O Dundee Road. Dartmouth, Massachusetts, November 25, 2004
 A dam in Russells Mills village, on Paskamansett/Slocums River, view from Rock O Dundee Road. Dartmouth, Massachusetts, November 13, 2003
 Boot Rock, view from Juniper Canyon Trail. Big Bend National Park, Texas, November 23, 2007
 Museum of S. I. Vavilov State Optical Institute with an old artistically decorated chimney and a Soviet-era exposition. The museum was settled in a former typewriting office (the room has reach interior because the building was expropriated from a wealthy family after the Great October Socialist Revolution). Vasilyevsky Island, Saint Petersburg, Russia, April 14, 1999.
 Brown and pinkish papery strips of bark of river birch (Betula nigra) on Deer Run Trail in Lick Creek Park. College Station, Texas, August 28, 2008
 Film-like papery peeling curls of bark of river birch (Betula nigra) on Deer Run Trail in Lick Creek Park. College Station, Texas, August 28, 2008
 Pedestal rock (differential weathering) near Turkey Pass Trail in Enchanted Rock State Natural Area. Fredericksburg, Texas, October 27, 2007
 Elephant Tusk Rock, view from Fresno Spring near Dodson Trail. Big Bend National Park, Texas, November 24, 2007
 Drying forest at Heritage Trail along Wabash River north from Lafayette. Indiana, September 11, 1999.
 Rock shelters of Hale Hollow Creek near East Trail in Lost Maples State Natural Area. Vanderpool, Texas, November 8, 2008
 Boot Rock from Boot Spring Trail. Big Bend National Park, November 28, 2009
 Boot Rock from Boot Spring Trail at sunrise. Big Bend National Park, November 28, 2009
 Boot Rock, view from Boot Spring Trail. Big Bend National Park, November 27, 2009
 View of Boot Rock from Boot Spring Trail. Big Bend National Park, November 27, 2009
 A trail along Wabash River at Ross Hills Park 5 miles west from Lafayette. Indiana, October 30, 1999.
 Rock shelters of Hale Hollow Creek East Trail in Lost Maples State Natural Area, at evening. Vanderpool, Texas, November 8, 2008
 Potholes Park, Fall Creek Gorge. The trip was organized by Purdue University International Center. Near Pine Village, Indiana, June 5, 1999.
 A birch alley in Sosnovka Park. Saint Petersburg, Russia, April 10, 1999.
 A narrow birch alley in Sosnovka Park. Saint Petersburg, Russia, April 10, 1999.
 Kathy Trail along Missouri River near Columbia, Missouri. October 23, 1999.
 Kathy Trail along Missouri River near Columbia, Missouri. October 23, 1999.
 Rocks along Missouri River, view from Kathy Trail near Columbia, Missouri. October 23, 1999.
 Rocks and bushes along Missouri River, view from Kathy Trail near Columbia, Missouri. October 23, 1999.
 Bushes on rocks along Missouri River, view from Kathy Trail near Columbia, Missouri. October 23, 1999.
 Overcoming a tub in a creek in Potholes Park (Fall Creek Gorge) by an international student of Purdue University. Near Pine Village, Indiana, June 5, 1999.
 Inspecting a creek in Potholes Park (Fall Creek Gorge) by international students of Purdue University. Near Pine Village, Indiana, June 5, 1999.
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