154 resultados para Aerial photography in soil surveys.
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Advance sheets--Field operations of the Bureau of Soils, 1919.
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"Advance sheets--Field operations of the Bureau of Soils, 1915".
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"Advance sheets - Field Operations of the Bureau of Soils, 1916."
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"Advance sheets--field operations of the Bureau of Soils, 1917".
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Includes one folded color map.
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"A joint project with the Rhode Island Department of Public Works in cooperation with the United States Bureau of Public Roads."
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"Advance sheets--field operations of the Bureau of Soils, 1918"--Cover.
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"Illinois Mine Subsidence Research Program."
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"Literature cited": p. 85.
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Cover title.
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Cover title.
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In cooperation with Virginia Agricultural Experiment Station.
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cover-title.
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"Reprinted from the Report on field operations of the Bureau of Soils for 1901."
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[Advance sheets--Field Operations of the Bureau of Soils, 1904]