Beitrag zur kenntniss der porphyre und petrographische beschreibung der quarzführenden porphyre in der umgegend von Halle an der Saale
Book digitized by Google from the library of University of Michigan and uploaded to the Internet Archive by user tpb. Reprinted from Deutsche geologische gesellschaft. Zeitschrift, bd.XVI, 3 Inaug.-diss.-Heidelberg
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