@misc{Humboldt_Alexander_von_(1769-1859)_Society,
 author={Humboldt, Alexander von (1769-1859)},
 howpublished={online},
 language={eng},
 type={rękopis},
 title={Society for the amelioration and gradual abolition of slavery (Drucktitel)},
 keywords={rękopisy},
}