Volume III/27 covers the magnetic properties of non-metallic inorganic compounds based on transition elements. It can therefore be considered as a supplement to volumes III/4 and III/12 "Magnetic and Other Properties of Magnetic Oxides and Related Compounds" which appeared in 1970 and in the period 1978 - 1982 respectively. The magnetic properties of the oxides with corundum, ilmenite and perovskite-type crystal structure and amorphous oxides are given in volume 27f, partly in the present subvolume III/27f3.