A very useful book for formal results especially about the semantics of relevance logics. The introduction and philosophical remarks are full of “Richard Routleyisms”. They tend to be Routley’s views rather than the views of the other authors and are fairly radical even for relevant logicians. Volume II updates Volume I and includes other topics such as conditionals, quantification, and decision procedures: R.Brady (ed.), Relevant Logics and their Rivals (Volum II), Aldershot: Ashgate, 2003.