Provisional translation provided by the Bahá'í World Centre, with notes by Keven Brown. See also Brown's article 'Abdu'l-Bahá's Response to the Doctrine of the Unity of Existence.
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=abdul-baha_sharh_wahdat_wujud.
Documents posted prior to October 2003 were at bahai-library.org [archive.org] and had completely different URLs.