AHLBURG, JOH. - Über die Verbreitung des Silurs, Hercyns und Rheinischen Devons und ihre Beziehungen zum geologischen Bau im östlichen Rheinischen Gebirge.

1920. Jb. K. Preuss. Geol. L.-Anst. f. 1919, Bd. XL-I-1; pp. 1-82, 2 fig. 1 fold. & col. geol. map 1:200.000 loosely inserted. Orig. extract, plain new wrps. very good.

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