Written for possible inclusion in The Bahá'í Encyclopedia Project, an ongoing project of the United States National Spiritual Assembly. Posted with permission of both the author and of the editor of the Encyclopedia project.
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=hassall_bahai_faith_australia.
Documents posted prior to October 2003 were at bahai-library.org [archive.org] and had completely different URLs.