@book{UBHD-1767981, author={Henrich, Theodor}, title={Die Hartsteinindustrie in der Rheinpfalz}, edition={[Maschinenschr.]}, year={1921}, pages={95 Bl.}, language={ger}, school={Heidelberg, Univ., Diss., 1921}, library={UB [Signatur: W 163]}, }