@Book{Gümbel1882,
author  = "Gümbel, Carl Wilhelm von",
title   = "Geologische Fragmente aus der Umgegend von Ems",
year    = "1882",
address = "München",
series  = "Sitzungsberichte",
volume  = "1882,10",
url     = "https://publikationen.badw.de/en/003394690",
}