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Gutachten über die gegenwärtige Lage des Rhein.-Westf. Steinkohlenbergbaus dem Reichswirtschaftsministerium Erstattet durch Dr. Schmalenbach [et al.]

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Gutachten über die gegenwärtige Lage des Rhein.-Westf. Steinkohlenbergbaus dem Reichswirtschaftsministerium Erstattet durch Dr. Schmalenbach [et al.]

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