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The volume documents compounds of boron with oxygen such as boron oxides, boron derived acids, their salts including peroxoborates, as well as organoboron species; it updates the preceding supplement series. Special attention is devoted to compounds which have become important in recent years as nonlinear optical materials. The main body of boron-oxygen compounds reviewed comprises borates, minerals with borate structures, and borate glasses. About 300 luminescent phosphors prepared from B2O2 are tabulated. A survey is presented of the large number of new organoboron species, especially linear and cyclic esters of substituted borinic and boronic acids. New information is given on the applications of H3BO3 in nuclear reactors and in fireproofing and preservation purposes; many systems containing H3BO3 are listed. Developments in the field of peroxoborate detergents are presented.