@misc{_N_[1944],
 copyright={Public Domain},
 address={Gotha},
 journal={Vogels Karte von Mitteleuropa. Fliegerkarte},
 howpublished={online},
 year={[1944]},
 publisher={Justus Perthes},
 language={ger},
 title={N 32-SO Hamburg},
 type={Image},
 URL={http://www.rcin.org.pl/igipz/Content/210100/PDF/WA51_190837_PTGC61-7-r1944_N-32-SO-Hamburg_0001.pdf},
 keywords={topographic maps, aerial maps, Hamburg, Schwerin (Germany; region), Hannover (Germany; region), Magdeburg (Germany; region), Braunschweig (Germany; region)},
}