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Ordovician and Silurian Graptolite Succession in the Trail Creek Area, Central Idaho--a Graptolite Zone Reference Section

出版	U.S. Government Printing Office, 1977
URL	http://books.google.com.hk/books?id=BQ1cEvq6GSoC&hl=&source=gbs_api
EBook	FULL_PUBLIC_DOMAIN