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Recommendations of the Bureau of Animal Industry on Problems of Livestock Production

Arthur Frederick SieversEverett Eugene EdwardsJohn Robbins MohlerMaude A. ThompsonRuth O'BrienStuart Bevier ShowWillard Hull WrightH. B. Raffensperger

其他書名	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
出版	U.S. Department of Agriculture, 1930
URL	http://books.google.com.hk/books?id=EiFiyWEQ7qMC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋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.