:::::::::::::::LeadSongDog, "primary, and first-party sources" in this case are "The White Books" of Foreign Offices of Russia and Germany of 1914-1915, and also "The Willy-Nicky Telegrams" (The Kaiser's letters to the Tsar, copied from the government archives in Petrograd, and brought from Russia by Isaac Don Levine, ed., with an introduction by N.F. Grant. London, Hodder and Soughton Ltd, 1920) and also "The Official Messenger of Petrograd" of January 31, 1915, where the telegram on Nicholas II of July 29, 1914 was published at first time in Russia.  
 :::::::::::::::Thus, all my 12 sourсes (and 3 sourсes of Wally Wiglet) are secondary RS.    Boris Romanov