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After reports of the Lewis and Clark Expedition were published in about 1807 , a small and steadily increasing stream of isolated pioneer groups began settling the valley and improving routes from the east set up by fur traders and mountain men .
 organization: Lewis and Clark Expedition
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
 Entities: Lewis and Clark Expedition 
Answer:
 organization: Lewis and Clark Expedition