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Annual Report of the Pennsylvania Department of Agriculture

其他書名	1881
出版	The Department, 1881
URL	http://books.google.com.hk/books?id=TIE5AQAAMAAJ&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN

註釋"Report of Pennsylvania Forestry Commission", published in 1896: 1895, pt. 2.