@misc{_International_1951,
 copyright={Public Domain},
 address={[Miejsce nieznane]},
 address={([Miejsce nieznane])},
 howpublished={online},
 year={1951},
 publisher={Civil Aeronautics Board. Bureau of Air Operations},
 publisher={(U.S. Government Printing Office)},
 language={eng},
 title={International airline operations in the Middle American area : [mapa]},
 type={Image},
 URL={http://www.rcin.org.pl/igipz/Content/216439/PDF/WA51_189204_PAND327-r1951_International-airline-Mid.pdf},
}