Newspapers in the Landesbibliothek: http://www.shlb.de/zeitung1.htm#A
Amtsblätter for Schleswig Holstein: Allerhöchst privilegirte schleswig-holsteinische Anzeigen and successors are digitally available from 1837 to 1900. A link to the various online issues can be found at Wikisource: https://de.wikisource.org/wiki/Schleswig-Holstein/
Gesetzblätter are also available at the same link.