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716
Mammoth Cave National Park, Kentucky Kings Mountain National Military Park
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Stalactites on cave ceiling Jean Lafitte National Historical Park and Preserve
Circa 1981
Mammoth Cave National Park, Kentucky Kings Mountain National Military Park
View on map 
Yellowstone photo album 4, page 171 Yellowstone National Park
View on map 
Circa 1930
View series 
Yellowstone photo album 4, page 135 Yellowstone National Park
View on map 
Circa 1930
View series 
Mammoth Cave Jean Lafitte National Historical Park and Preserve
View on map 
Circa 1981
Mammoth Cave National Park, Kentucky Kings Mountain National Military Park 19 C mammoth Cavve
View on map 
Mammoth Cave National Park, Kentucky Kings Mountain National Military Park 69 C mammoth cane
View on map 
Rotunda, Mammoth Cave National Park, Kentucky Kings Mountain National Military Park Rotunda Mammoth Cave
View on map 
Gypsum formations, Mammoth Cave National Park, Kentucky Kings Mountain National Military Park mammoth Cave
View on map 
Yellowstone photo album 4, page 172 Yellowstone National Park
View on map 
Circa 1930
View series 
Wind Cave National Park, South Dakota Kings Mountain National Military Park NPS WICA
View on map 
Unidentified cave entrance Mammoth Cave National Park; National Park Service
View on map 
1938-06
Cave, Robertson's Avenue Mammoth Cave National Park; National Park Service
View on map 
1940-07
Cave, Robertson's Avenue Mammoth Cave National Park; National Park Service
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1940-07
Travertine formations, Mammoth Cave National Park, Kentucky Kings Mountain National Military Park Travertine Formations MCNP
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Unidentified cave entrance Mammoth Cave National Park; National Park Service
View on map 
1938-06
Yellowstone photo album 7, page 66 Yellowstone National Park
View on map 
Circa 1925
View series 
Small cave along dirt road, near Hodgenville, Kentucky Abraham Lincoln Birthplace National Historical Park
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Circa 1909
Blue Grotto Caves, Lava Beds National Monument, California Kings Mountain National Military Park Blue Grotto Cave
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