  We report low frequency observations of the quasi-periodic, circularly
polarized, harmonic type III radio bursts whose associated sunspot active
regions were located close to the solar limb. The measured periodicity of the
bursts at 80 MHz was $\approx$ 5.2 s and their average degree of circular
polarization ($dcp$) was $\approx 0.12$. We calculated the associated magnetic
field $B$ : (1) using the empirical relationship between the $dcp$ and $B$ for
the harmonic type III emission, and (2) from the observed quasi-periodicity of
the bursts. Both the methods result in $B \approx$ 4.2 G at the location of the
80 MHz plasma level (radial distance $r \approx 1.3~\rm R_{\odot}$) in the
active region corona.
