Description and chemical composition of manganese nodules in a core located in the Nares Abyssal Plain, Atlantic Ocean

Three nodules from a core taken north of Puerto Rico are composed chiefly of an x-ray amorphous, hydrated, iron-manganese oxide, with secondary goethite, and minor detrital silicates incorporated during growth of the nodules. No primary manganese mineral is apparent. The nodules are enriched in iron and depleted in manganese relative to Atlantic Ocean averages. The formation of these nodules appears to have been contemporary with sedimentation and related to volcanic activity.

Migratory farmworkers in the midcontinent streams /

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Pulpwood production in the Northeast, 1967 /

Mode of access: Internet.

Report on the census of Porto Rico, 1899.

Published also in Spanish.

Design and construction of continously reinforced concrete airport pavements : final report /

Final report; August 1977.

An evaluation of expedient methodology for identification of potentially expansive soils /

Prepared by Soils and Pavements Laboratory, U.S. Army Engineer Waterways Experiment Station, Vicksburg, Miss., under contract no. PO 4-1-0195.

The economics of machinery choice in corn production /

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Changes in spatial grain-price patterns in the United States and in the North Central region, 1946-1958 /

"Agricultural experiment stations of Alaska, Illinois, Indiana, Iowa, Kansas, Michigan, Minnesota, Missouri, Nebraska, North Dakota, Ohio, South Dakota, Wisconsin, and the U.S. Department of Agriculture, cooperating."

Disposing of surplus fluid milk in midwestern markets /

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The expanding soybean meal market : how changes in feeding practices and growth of the formula feed industry have affected demand /

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Experimental corn hybrids tested in 1956 /

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Experiments in eradicating field bindweed /

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Floricultural sales in mass market outlets /

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Inorganic chemicals as aids in burning hardwood tree stumps /

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Listerellosis in domestic animals : a technical discussion of field and laboratory investigations /

Mode of access: Internet.