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Comparative Yields of Hay, from Several Varieties and Strains of Alfalfa, at Brookings, Highmore, Cottonwood and Eureka

Albert Nash HumeNiels Ebbesen HansenChristian LarsenGuy Edgar YoungburgJames Wilbur Wilson

出版	Agricultural Experiment Station, South Dakota State College of Agriculture and Mechanic Arts, 1915
URL	http://books.google.com.hk/books?id=V6FQAQAAMAAJ&hl=&source=gbs_api