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Problems of the Geographic and Stratigraphic Distribution of American Middle Eocene Larger Foraminifera

Axel Adolf OlssonCharles W. CopelandGerd Ernst Gerold WestermannJames Elvin ConkinNorman Edward WeisbordWilliam Storrs ColeBarbara M. ConkinEsther English Richards ApplinRichard E. Petit

出版	Paleontological Research Institution, 1964
URL	http://books.google.com.hk/books?id=hYTDwAEACAAJ&hl=&source=gbs_api