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acres agencies American annually balance of nature basic birds coal conservation movement conservation problem conservation program Contour plowing copper cover crops dams Department of Agriculture depleted deposits destroy destruction develop diseases drainage basin economic eroded erosion farm farmers Federal government fertile fire fish floods forest lands forest products Forest Service Forests and Grasslands Franklin D fur-bearing animals future grass grasslands grazing gullies habitats hydroelectric power important industry insects iron irreplaceable irrigation millions mineral mineral resources National Forests National Wildlife Federation natural resources nearly numbers º º pamphlet passenger pigeon petroleum plants plowing practices precipitation predators rainfall recent region reserves result River servation slopes Soil Conservation Service species streams strips surface Theodore Roosevelt thoughtless timber tion top soil trees United States Department Valley various vast waste water table wild wildlife resources William Vogt World War II