Within the portal avhumboldt.de a <ref xmlns="http://www.tei-c.org/ns/1.0" target="http://www.avhumboldt.de/?p=6769">digitized b</ref> ibliography of Alexander von Humboldt's independently published writings has been provided since 2009 under the direction of Tobias Kraft. The data of this bibliography was converted into XML and integrated into the database of <hi xmlns="http://www.tei-c.org/ns/1.0" rendition="#i">edition humboldt digital to</hi> be displayed in the chronology.