| http://www.w3.org/ns/prov#value | - Summoning; oaths; production of books and papers; fees For the purpose of any investigation which, in the opinion of the Secretary of Transportation, is necessary and proper in carrying out this chapter, the Secretary may subpoena witnesses, administer oaths and affirmations, take evidence, and require the production of books, papers, or other documents that are relevant to the matter under invest
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