... where the same products they supply can be raised on an industrial scale of investment and profit. Thus the worth of a field of tomatoes in the Northern Neck of Virginia is affected by massive irrigated production in the Central Valley of California, and thus a Shenandoah farmer may barely break even or suffer a loss on a rather good crop of wheat in the old "bread ... — The Nation's River - The Department of the Interior Official Report on the Potomac • United States Department of the Interior
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