Sistemas de produção tradicional e melhorado no Chókwe/1991
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![[William Wheeler Hubbell, authorized to apply for patents.]](https://covers.openlibrary.org/b/id/10200621-M.jpg)
United States. Congress. Senate. Committee on Patents
Kokuritsu Kokkai Toshokan (Japan)
United States. Bureau of the Census
United States. General Accounting Office
Jared M. Diamond
Canada. Dominion Bureau of Statistics.