Volume II/17 c is the third part of a supplement to the pre-
vious compilations II/1 and II/9 a-d2 on magnetic properties
of free radicals published in 1965 and 1977-1980, which
covered the literature up to 1975. Due to the still very
rapid development of the field and the inclusion of new sub-
jects, the supplement covering the period 1975-85 had to be
split into subvolumes, which will appear in fast succession.
Togetherwith the ealier volumes, II/17 offers an up-to-date
and comprehensive surveyand a collection of data on impor-
tant chemical intermediates.