Use reasoning to lead to the answer of the following question:
They had to know where to go, they got on the national highway after consulting the what?\nOptions:\n- canada\n- atlas\n- united states\n- major cities\n- book
 Reasoning process:
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Atlas is a books of map which shows various routes. One can consult an atlas to know about routes to reach a place. Therefore, the final answer is atlas.
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