This title was first published in 2003. Relevant Logics and their Rivals, Volume II extends the material of the first volume in two ways. First, it includes work done in the 1970s which expands on and applies the Routley-Meyer semantics (introduced in the first volume), together with an Appendix which offers a critique of the whole process of extensional reduction. Secondly, the volume includes material from the 1980s and 1990s which brings the Routley-Meyer semantics up to date and introduces a wide range of cognate topics in relevant logic. The two volumes together provide a treatise on Australian research into relevant and related logics since the early 1970s, enhanced by the work of a number of co-workers from abroad.