Note: there is an error on page 25 in the PDF below. The paragraphs following "In J-2 [Jamádíy'th—Thání, a lunar month]" should be indented. See the image scans for reference.
Documents posted between 2003-2012 had slightly different URLs and can be found in archive.org with addresses like bahai-library.com/?file=rabbani_conversion_great-uncle_bab.