HOLLMANN, F. - Die Sprockhöveler Schichten des Niederrheinisch-Westfälisch Steinkohlengebietes. Die Identifizierung und Ausbildung ihrer Flöze, Fazies und Paläogeographie sowie ihr Lagerstättenvorrat.

1967. Diss. TH Aachen. 172 pp. 38 fig. 12 fold. plts. with maps. Orig. wrps. sm8vo.

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