If you would like to help expand this chart, please download the document timeline_major_letters_guardian.rtf, update it, and then contact us.
See also detailed discussion of some of the Guardian's writings, and how they got their titles, in Nakhjavani's Shoghi Effendi: The Range and Power of His Pen.
Documents posted between 2003-2012 had various slightly different URLs and sometimes can be found in archive.org with addresses like bahai-library.com/file.php5?file=timeline_major_letters_guardian.