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| Donald Worster- "Title"- Dust Bowl- The Southern Plains in the 1930’s. – Copyright 1979- |
| (www.english.uiuc.edu/maps/depression/overview.htm) |
| (www.smccd.net/accounts/hudsont/protected/ushist/depress.html) |
| (www.rra.dst.tx.us/c_t/History/Great/Depression) |
| (www.lib.niu.edu/ipo/ihy981212 .html) |