558 resultados para Washington (D.C.) Filtration plant.
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Contribution from Bureau of Plant Industry, Soils, and Agricultural Engineering.
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Contribution from Bureau of Plant Industry.
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Includes 124 p. of plates.
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Contribution from Bureau of Plant Industry.
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Includes index.
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"Under the direction of Emily L. Day."
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Cover title.
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"Taxonomic papers relating to the genus Trichobaris": p. 3-4.
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Contribution from Bureau of Entomology and Plant Quarantine.
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"July 1937."
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Cover title.
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Contribution from Bureau of Entomology and Plant Quarantine.
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"The work represented by this publication was supported by the Bankhead-Jones research fund. It was initiated in the Bureau of chemistry and soils (now the Bureau of agricultural chemistry and engineering) and was later transferred to the Bureau of plant industry."--P. 1.
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Contribution from Bureau of Entomology and Plant Quarantine.
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Prepared jointly by specialists of the United States Department of Agriculture, Cornell University, and the experiment stations of California, Louisiana, Minnesota, Texas, and Virginia.