Question: What is the name of a National Preserve located in the Flint Hills region of Kansas and is home to a population of genetically pure American bison?

full_context: Document 1: American bison: The American bison ("Bison bison"), also commonly known as the American buffalo or simply buffalo, is a North American species of bison that once roamed the grasslands of North America in massive herds. They became nearly extinct by a combination of commercial hunting and slaughter in the 19th century and introduction of bovine diseases from domestic cattle, and have made a recent resurgence largely restricted to a few national parks and reserves. Their historical range roughly comprised a triangle between the Great Bear Lake in Canada's far northwest, south to the Mexican states of Durango and Nuevo León, and east to the Atlantic Seaboard of the United States (nearly to the Atlantic tidewater in some areas) from New York to Georgia and per some sources down to Florida. Bison were seen in North Carolina near Buffalo Ford on the Catawba River as late as 1750.
Document 2: Sheyenne National Grassland: Sheyenne National Grassland is a National Grassland located in southeastern North Dakota in the United States, comprising 70446 acre of public land amid 64,769 acre of privately owned land in a region of sandy soils in the vicinity of the Sheyenne River in Ransom and Richland Counties. It is the only National Grassland in the tallgrass prairie region of the U.S. The grassland provides habitat for the largest population of greater prairie chickens in North Dakota, as well as the Dakota skipper butterfly, the western prairie fringed orchid, and numerous ferns, as well as grazing land for approximately 83 cattle ranchers.
Document 3: American Prairie Reserve: The American Prairie Reserve (APR) is an independent non-profit organization that has privately undertaken a project in northeastern Montana to create a wildlife conservation area of over three million contiguous acres through a combination of both private and public lands. APR’s goal is to acquire and manage approximately 500,000 private acres, which will serve to “glue together roughly three million acres of existing public land” to create a wildlife complex for conservation and public access. National Geographic has compared the project to the creation of an American Serengeti in a DVD it created about this region in 2010 (“American Serengeti”). <sup class="reference plainlinks nourlexpansion" id="ref_http://channel.nationalgeographic.com/episode/american-serengeti-3765/Overview">[#endnote_]</sup> In a global assessment prepared for the Temperate Grasslands Conservation Initiative (TGCI), scientists identified the area of APR in northeastern Montana as one of only four remaining areas in the world that are viable options for landscape-scale grasslands conservation. To promote tourism and encourage donations, APR has opened a high-end safari lodge and it continues to operate low-cost campgrounds, recruit volunteers and acquire land.
Document 4: Wind Cave bison herd: The Wind Cave bison herd is a herd of 250–400 American bison in Wind Cave National Park, South Dakota, USA. It is believed to be one of only four free roaming and genetically pure herds on public lands in North America. The other three herds are the Yellowstone Park bison herd, the Henry Mountains bison herd in Central Utah, and at Elk Island National Park in Alberta, Canada. The Wind Cave herd are of the Plains bison subspecies ("Bison bison bison").
Document 5: Tallgrass Prairie Preserve: The Tallgrass Prairie Preserve, located in Osage County, Oklahoma near Foraker, Oklahoma, is owned and managed by The Nature Conservancy. It is protected as the largest tract of remaining tallgrass prairie in the world. The preserve contains 39000 acre owned by the Conservancy and another 6000 acre leased in what was the original tallgrass region of the Great Plains that stretched from Texas to Manitoba.
Document 6: Nine Mile Prairie: Nine Mile Prairie (named for its location 5 mi west and 4 mi north of downtown Lincoln) is a 230 acre tract of conserved tallgrass prairie in Lancaster County, Nebraska, United States. Except for one small portion of it that was farmed as recently as the 1950s, Nine-Mile Prairie has never been plowed (some of the land has at times been grazed as recently as the 1960s). As such, it is one of the largest areas of virgin tallgrass prairie in the state of Nebraska. It has been listed on the National Register of Historic Places since 1986.
Document 7: Osage Plains: The Osage Plains are a physiographic section of the larger Central Lowland province, which in turn is part of the larger Interior Plains physiographic division. The area is sometimes called the Lower Plains, North Central Plains, and the Rolling Plains. The Osage Plains, covering west-central Missouri, the southeastern third of Kansas, most of central Oklahoma, and extending into north-central Texas, is the southernmost of three tallgrass prairie physiographic areas. It grades into savanna and woodland to the east and south, and into shorter mixed-grass prairie to the west. The Osage Plains consist of three subregions. The Osage Plains proper occupy the northeast segment. Although sharply demarcated from the Ozark uplift, the Plains are nonetheless a transitional area across which the boundary between prairie and woodland has shifted over time. In the central portion of the physiographic area lies the second subregion, the Flint Hills, commonly called "The Osage" in Oklahoma. This large remnant core of native tallgrass prairie is a rocky rolling terrain that run from north to south across Kansas and extends into Oklahoma. To the west and south of these hills are the Blackland Prairies and Cross Timbers. This vegetatively complex region of intermixed prairie and scrubby juniper-mesquite woodland extends into north-central Texas. Bluestem prairies and oak-dominated savannas and woodlands characterize the natural vegetation in the Cross Timbers. Much of the area has been converted to agriculture, although expanses of oak forest and woodland are still scattered throughout the eastern portion of the subregion.
Document 8: Little Missouri National Grassland: Little Missouri National Grassland is a National Grassland located in western North Dakota, USA. At 1028051 acres , it is the largest grassland in the country. Enclaved within its borders is Theodore Roosevelt National Park, which is managed by the National Park Service (and therefore not included in the preceding statistics). The Little Missouri National Grassland was once a part of the Custer National Forest, but is now a part of the Dakota Prairie Grasslands, a National Forest unit consisting entirely of National Grasslands. A predominant feature of the grassland is colorful and beautiful badlands, a rugged terrain extensively eroded by wind and water. It is a mixed grass prairie, meaning it has both long and short grass.
Document 9: Tallgrass Prairie National Preserve: Tallgrass Prairie National Preserve is a United States National Preserve located in the Flint Hills region of Kansas, north of Strong City. The preserve protects a nationally significant example of the once vast tallgrass prairie ecosystem. Of the 400,000 square miles (1,000,000 km) of tallgrass prairie that once covered the North American continent, less than 4% remains, primarily in the Flint Hills. Since 2009, the preserve has been home to the growing Tallgrass Prairie bison herd.
Document 10: Henry Mountains bison herd: The Henry Mountains bison herd, numbering 250 to 400 bison, is one of only four free roaming and genetically pure herds on public lands in North America. The other three herds are the Yellowstone Park bison herd which was the ancestral herd for the Henry Mountains animals, the Wind Cave bison herd in South Dakota and the herd on Elk Island in Alberta, Canada.
Document 11: Tallgrass Prairie National Preserve: Tallgrass Prairie National Preserve is a United States National Preserve located in the Flint Hills region of Kansas, north of Strong City. The preserve protects a nationally significant example of the once vast tallgrass prairie ecosystem. Of the 400,000 square miles (1,000,000 km) of tallgrass prairie that once covered the North American continent, less than 4% remains, primarily in the Flint Hills. Since 2009, the preserve has been home to the growing Tallgrass Prairie bison herd.
Document 12: Konza Prairie biosphere reserve: Konza Prairie biosphere reserve is a biosphere reserve located in the Flint Hills region of north-eastern Kansas, approximately 10 km south of the city of Manhattan. The Flint Hills are steep-sloped and overlain by shallow limestone soils unsuitable for cultivation. This region contains the largest remaining area of tallgrass prairie in North America since the majority of the Konza Prairie and the surrounding landscape have not been ploughed.
Document 13: National Bison Range: The National Bison Range (NBR) is a National Wildlife Refuge located in western Montana established in 1908 to provide a sanctuary for the American bison. The NBR is one of the oldest National Wildlife Refuges in the United States. The size of the bison herd at the NBR is relatively small, numbering between 350 and 500 individuals. The initial herd of American bison was provided by organizations such as the American Bison Society, and today the refuge serves as the central point for bison research in the United States.
Document 14: Northern short grasslands: The Northern short grasslands is one of 867 terrestrial ecoregions defined by the World Wide Fund for Nature. This ecoregion includes parts of the Canadian provinces of Alberta and Saskatchewan, and the American Great Plains states of Montana, North Dakota, Wyoming, South Dakota and Nebraska. The United States Environmental Protection Agency (EPA) further breaks this ecoregion into the Northwestern Glaciated Plains and Northwestern Great Plains.
Document 15: Tallgrass Prairie bison herd: The Tallgrass Prairie bison herd is a population of genetically pure American bison ("Bison bison") inhabiting the Tallgrass Prairie National Preserve in central Kansas.
ground_truth: Tallgrass Prairie National Preserve