Question: Laton Alton Huffman was an American photographer who worked at an Army post  situated on the south bank of the Yellowstone River, at the mouth of what?
{'answer': 'the Tongue River', 'supporting_facts': [['Laton Alton Huffman', 0], ['Laton Alton Huffman', 2], ['Fort Keogh', 0], ['Fort Keogh', 1]]}