Soil survey of the periyar tract
Norris, R.V., Sivan, M.R.R., Ayyar, S.K.
Soil survey of the periyar tract - Madras 1923 - 1-6 p. - Soil Madras Department of Agriculture. Bulletin No. 84 .
Soil survey of the periyar tract - Madras 1923 - 1-6 p. - Soil Madras Department of Agriculture. Bulletin No. 84 .