Author: Bertels, G.A., 1874.:
Title: Ein neues vulkanisches Gestein. (Separat-Abdruck aus den Verh. der Würzburger physik.-med. Gesellschaft, N.R., VIII. Bd.]
Description: Würzburg: Stahel, 1874. 8vo, 21.5cm. Pp. 32, 1 fold. lithogr. panoramic plate showing "Der Sengelberg bei Dorf Salz in Nassau", 1 fold. petrogr. sketch map. Orig. printed wrappers. Waterstain throughout text, plates practically unaffected, age wear to covers, good otherwise. - With author's presentation inscription to Prof. Fridolin von Sandberger (1826-1898).

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