Recommendations of the Bureau of Animal Industry on Problems of Livestock Production: Prepared for the Information of Livestock Owners, Agricultural Writers, County Agents, Livestock Specialists, the Meat Trade, Bureau Employees and Others Interested in the Betterment of the Live Stock Industry
Arthur Frederick Sievers · Everett Eugene Edwards · John Robbins Mohler · Maude A. Thompson · Ruth O'Brien · Stuart Bevier Show · Willard Hull Wright · H. B. Raffensperger
Jan 1930 · U.S. Department of Agriculture
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This bulletin gives the results of tests of all samples of ledge rock made by the Bureau of Public Roads to January 1, 1928, classified alphabetically according to location. In this revision of the earlier bulletins, each entry has been checked back to the original records, and a number of tests on manufactured road-building materials have been omitted. The results of tests of approximately 6,000 samples are now available in this bulletin, and these tests represent road-building material from practically all parts of the United States.
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