Alleghenská plošina (Czech Wikipedia)

Analysis of information sources in references of the Wikipedia article "Alleghenská plošina" in Czech language version.

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Merriam-Webster's Geographical Dictionary. 3. vyd. Springfield, Massachusetts, U. S. A.: Merriam-Webster, Incorporporated, Publishers, 1997. 1361 s. Dostupné online. ISBN 0-87779-546-0. S. 33. (anglicky)