Elkanah Billings (Czech Wikipedia)

Analysis of information sources in references of the Wikipedia article "Elkanah Billings" in Czech language version.

refsWebsite

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1books.google.com

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books.google.com

William Miller. Trace Fossils: Concepts, Problems, Prospects. [s.l.]: Elsevier, 2007. Dostupné online. ISBN 0-444-52949-7. S. 19–20.