Volume III/27 deals with magnetic properties of non-metallic inorganic compounds such as pnictides, chalcogenides, halides, borates, silicates and phosphates, based on transition metal elements. Subvolume 27B covers the magnetic and related properties of lanthanide pnictides and chalcogenides (except oxides). During the last decades considerable progress in the research of these families of substances has been made which have been compiled in the three parts 27B1, 27B2 and 27B3. The first part B1 with a compilation of the properties of monopnictides is published now. Parts B2 and B3 cover the monochalcogenides and the more complex (binary and ternary) compounds, respectively.