Вальх, Иоганн Эрнст Иммануил (Russian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Вальх, Иоганн Эрнст Иммануил" in Russian language version.

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1wikisource.org

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1web.archive.org

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Robert Kihm; James St. John. Walch's trilobite research — A translation of his 1771 trilobite chapter // Fabulous fossils : 300 years of worldwide research on trilobites. — Albany, N.Y.: University of the State of New York, 2007. — P. 115-140. — (New York State Museum bulletin).

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ru.wikisource.org

Энциклопедический словарь Брокгауза и Ефрона