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Soil Survey, Huntingdon County, Pennsylvania

Howard William HigbeeSamuel Rankin BaconRichard Thomas Avon BurkeAustin Lathrop Patrick

出版	U.S. Department of agriculture, Agricultural research administration, Bureau of plant industry, soils and agricultural engineering, 1944
URL	http://books.google.com.hk/books?id=c0OLNR5ifSUC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN