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An analysis of Chinese data on root and tuber crop production
Stone, Bruce, (1984)
Summer and fall vegetables for fresh market, summer melons, sweetpotatoes
(1959)
Prices and spreads for potatoes, sweetpotatoes, and other selected vegetables sold in fresh markets, 1962/63-1966/67
Edman, Victor G., (1970)
Statističeskij sbornik
Nikolʹskaja, V. S., (1957)