Though published by Landegg and later Asr-i-Jadid, these volumes were largely unavailable except for purchase at the London conferences. Some of the volumes are thematic, including on notable Bahá'ís; others include works on important historical figures and scholars, detailed investigations of certain Bahá'í scriptures, and papers and commentaries on Persian culture. These conferences started in the early 1990s in Landegg, then moved to Tambach for short period, and finally came to London.