This is a set of six books, first published between 1992 and 2000. They are available from Galata. Some of them are now out of print, but they turn up on eBay fairly regularly.
80pp. 1992, reprinted 1993,1995,1999, 2019
36pp. 1994
64pp. 1995
76pp, 1996.
84pp, 1998
(with P. Withers). 72pp. 2000