@book{28735,
	author = {Georg D. W. Callwey (Monachium)},
	title = {Ostpreußen, seine Vergangenheit, Gegenwart und Zukunft.},
	publisher = {Verlag von Georg D. W. Callwey,},
	year = {1915.},
	series = {Kriegsveröffentlichungen des Deutschen Bundes Heimatschutz},
	address = {München :},
	url = {https://kpbc.umk.pl/dlibra/publication/247758/edition/252581/content}
}