Ruhr, B. (1926). Die rheinisch-westfälische Portlandzementindustrie.
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Chicago Style (17th ed.) Citation
Ruhr, Bernhard. Die Rheinisch-westfälische Portlandzementindustrie. Frankfurt/M, 1926.
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MLA citiranje
Ruhr, Bernhard. Die Rheinisch-westfälische Portlandzementindustrie. 1926.
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