Contains 17 papers presented at a seminar on ceramic thin-sectioning held in London. The ceramics studied range in date from the prehistoric to the post-medieval periods. For individual papers see 20-1971, 20-1978, 20-1979, 20-1991, 20-1997, 20-1999, 20-2002, 20-2011, 20-2017, 20-2029, 20-2034, and 20-2040. -- AATA