Campbell has published a number of books including seven volumes of memoirs. Volumes 3, 4, 7, and 8 were published simultaneously with limited special editions. A bibliography in three additional volumes catalogues his publications. She has published eight out of a planned ten volumes. Others have pages or even whole volumes missing. Discounts are available for large volumes of mail. Sixteen of the eighteen volumes are now available. It featured many of the characters appearing in volumes one and two. Private Bags are available for recipients of large mail volumes. It consists of eight volumes and about 115,000 words. It can be expressed in terms of volumes or weights. Air cavities are containers of air molecules of specific volumes and masses. It is unknown about the release of the two remaining volumes. Helena Whitbread published some of the diaries in two volumes (1988 and 1992). It is designed to protect data by providing encryption for entire volumes.