@misc{Wielka_Brytania._Ordnance_Survey._Wydawca_Germany_1918,
 author={Wielka Brytania. Ordnance Survey. Wydawca},
 copyright={Public Domain},
 address={[Miejsce nieznane]},
 howpublished={online},
 year={1918},
 publisher={Ordnance Survey},
 language={eng},
 title={Germany 1:100,000. 1.L.},
 type={Image},
 URL={http://rcin.org.pl/Content/91121/PDF/WA51_94247_PANC842-1-r1918_Germany-Sheet-1L.pdf},
 keywords={Aachen (Germany ; region), topographic maps},
}