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But with the decline of the price of lead from £ 33 a ton in 1801 to £ 13 10 s in 1831 a depression followed during which people left the dale in search of work ; some to the factories in Derbyshire and Lancashire , others to the mines in County Durham , a significant number also emigrated to America .
 Derbyshire, Lancashire, County Durham, America
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: media, plant, vehicle, astronomical object, time, disease, animal, location, person, organization, mythical figure, food, biology, geographical phenomenon, instrument, event 
Text: {0} 
Answer:
 Derbyshire, Lancashire, County Durham, America