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

1921. Jahrbuch der Preussischen Geologischen Landesanstalt zu Berlin für das Jahr 1919, Band XL, Teil I; pp. 1-82, 2 fig. 1 plt. h.t. with col. geol. map folding-out. Orig extract, plain new wrps. very good.

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