@misc{_Catalogo_1921,
 address={Tacubaya, D. F. Mexico},
 howpublished={online},
 year={1921},
 publisher={Direccion de Estudios Geograficos y Climatologicos},
 language={spa},
 title={Catalogo Astrofotografico del Observatorio Astronomico de Tacubaya, Mexico Zona de -16°},
 keywords={Astrographic catalogue, stars declination -16°, Tacubaya observatory},
}