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Silicified Ordovician Brachiopods from East-Central Alaska

Reuben James RossJ. Thomas Dutro

出版	Smithsonian Institution, 1966
URL	http://books.google.com.hk/books?id=CeuFbsRFvF8C&hl=&source=gbs_api

註釋

Focuses on a thirteen-year-old boy who works on his family's farm, caring for livestock, harvesting hay, and preparing to manage the farm himself one day.