1. Hóhenschichten-Karte Ost- und Westpreussens : Königsberg Maps University Of Minnesota Public content 1881. Jentzsch, Alfred, 1850-1925. Relief shown by gradient tints, form lines, and spot heights. Depths shown by bathymetric tints, soundings, and isolines.; "Jn Commission bei Wilh.... Physikalisch-Oeconomischen Gesellschaft (Königsberg).