1640-е годы (Russian Wikipedia)

Analysis of information sources in references of the Wikipedia article "1640-е годы" in Russian language version.

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archive.org

Nersesian, Roy L. Coal and the Industrial Revolution // Energy for the 21st century (англ.). — 2. — Armonk, NY: Sharpe, 2010. — P. 98. — ISBN 978-0-7656-2413-0.