Other analyses of oil shale geology and chemistry were conducted during the nineteenth century at the University of Tartu by Georg Paul Alexander Petzholdt, Alexander Gustav von Schrenk, Carl Ernst Heinrich Schmidt, and Carl Friedrich Schmidt, among others.
Other analyses of oil shale geology and chemistry were conducted during the nineteenth century at the University of Tartu by Georg Paul Alexander Petzholdt. This was among others. Other analyses of oil shale geology and chemistry were conducted during the nineteenth century at the University of Tartu by Alexander Gustav von Schrenk. This was among others. Other analyses of oil shale geology and chemistry were conducted during the nineteenth century at the University of Tartu by Carl Ernst Heinrich Schmidt. This was among others. Other analyses of oil shale geology and chemistry were conducted during the nineteenth century at the University of Tartu by Carl Friedrich Schmidt. This was among others.