Helmer, L. A. (1971). Die Schleifersilikose im Bergischen Land.
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Chicago Style (17th ed.) Citation
Helmer, Ludger Andreas. Die Schleifersilikose Im Bergischen Land. Düsseldorf, 1971.
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MLA (9th ed.) Citation
Helmer, Ludger Andreas. Die Schleifersilikose Im Bergischen Land. 1971.
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Warning: These citations may not always be 100% accurate.