Drafting conscript workers was one thing. But unless they were adequately fed they were useless. There was no industry in the 1940s in which the correlation between labour productivity and calorific input was more direct than in mining.91 But after 1939 the food supply in Western Europe was no less constrained than the supply of coal.92 As was true of Germany, the high-intensity dairy farms of France, the Netherlands and Denmark were dependent on imported animal feed. Grain imports in the late 1930s had run at the rate of more than 7 million tons per annum mostly from Argentina and Canada.
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