The digital collection Die Julikrise 1914 has been created by the Politisches Archiv of the Auswärtiges Amt in Berlin, the German Foreign Office. In the twenties Max Graf Montgelas and Walter Schücking edited diplomatic documents relating to the July crisis in the “Kautsky-Edition” (Die deutsche Dokumenten zum Kriegsausbruch, first edition, 4 vol., Charlottenburg 1919; second enlarged edition 1927). In this digital collection you can find the original documents from June 15 until August 6, 1914, often with clear indications of changes between concept(s) and the final version. There is also a link to a digital version of the 1919 edition. The documents are accompanied by introductions to their background and use. The collection is only accessible in German.
Among the Karl Kautsky Papers held at the International Institute for Social History in Amsterdam is a handwritten document relating to the 1919 edition of documents concerning the July crisis (A 85).