Question: when did the bureau of land management start
[{'answer': '1946', 'provenance': [{'wikipedia_id': '54139', 'title': 'Bureau of Land Management', 'start_paragraph_id': 1, 'start_character': 261, 'end_paragraph_id': 1, 'end_character': 265, 'bleu_score': 1.0, 'section': 'Section::::Abstract.'}]}, {'provenance': [{'wikipedia_id': '54139', 'title': 'Bureau of Land Management', 'start_paragraph_id': 1, 'start_character': 0, 'end_paragraph_id': 1, 'end_character': 717, 'bleu_score': 0.745549221457198, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 14533493047310077497}, 'section': 'Section::::Abstract.'}]}]