Classifier Instance:

Anchor text: Nathaniel P. Langford
Target Entity: Nathaniel_P\u002e_Langford
Preceding Context: During the last 25 years of the 19th century, the mountains of the Teton Range became a focus for explorers wanting to claim first ascents of the peaks. However, Caucasian explorers probably weren't the first to climb many of the peaks and the earliest first ascent of even the formidable Grand Teton itself may have been achieved long before written history documented it. Native American relics remain including The Enclosure, an obviously man–made structure that is located about below the summit of Grand Teton at a point near the Upper Saddle .
Succeeding Context: and James Stevenson, both members of the Hayden Geological Survey of 1871, found The Enclosure during their early attempt to summit Grand Teton in 1872. Langford claimed that he and Stevenson climbed Grand Teton, but were vague as to whether they had made it to the summit. Their reported obstacles and sightings were never corroborated by later parties. Langford and Stevenson likely did not get much further than The Enclosure. The first ascent of Grand Teton that is substantiated was made by William O. Owen, Frank Petersen, John Shive and Franklin Spencer Spalding on August 11, 1898. Owen had made several previous attempts on the peak and after publishing several accounts of this first ascent, discredited any claim that Langford and Stevenson had ever reached beyond The Enclosure in 1872. The disagreement over which party first reached the top of Grand Teton may be the greatest controversy in the history of American mountaineering. After 1898 no other ascents of Grand Teton were recorded until 1923.
Paragraph Title: History of mountaineering
Source Page: Grand Teton National Park

Ground Truth Types:

Predicted Types:

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