Втора индустриална революция (Bulgarian Wikipedia)

Analysis of information sources in references of the Wikipedia article "Втора индустриална революция" in Bulgarian language version.

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archive.org

(англ.) Smil, Vaclav. Creating the Twentieth Century: Technical Innovations of 1867 – 1914 and Their Lasting Impact. Oxford; New York, Oxford University Press, 2005. ISBN 0195168747.