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Combine harvesters manufactured by Claas KGaA pass through a field of wheat during the summer harvest at the OAO Krasny Vostok Agro agricultural enterprise near Bolshiye Achasary village in the Republic of Tatarstan, Russia, on Sunday, July 26, 2015. Russia will ship more wheat overseas this season than anytime in history, helped by a surge in exports in May and June, according to ZAO Rusagrotrans, which transports grain by rail. Photographer: Andrey Rudakov/Bloomberg via Getty Images

Combine harvesters manufactured by Claas KGaA pass through a field of wheat during the summer harvest at the OAO Krasny Vostok Agro agricultural enterprise near Bolshiye Achasary village in the Republic of Tatarstan, Russia, on Sunday, July 26, 2015. Russia will ship more wheat overseas this season than anytime in history, helped by a surge in exports in May and June, according to ZAO Rusagrotrans, which transports grain by rail. Photographer: Andrey Rudakov/Bloomberg via Getty Images