Calvin Coolidge about food (“State of the Union Address”, 3 December 1924) - The production of nitrogen for plant food in peace and explosives in war is more and more important.
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The production of nitrogen for plant food in peace and explosives in war is more and more important.
 Calvin CoolidgeState of the Union Address (3 December 1924). copy citation

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3 December 1924
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English
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