by Read, N. E.
-- New Zealand Society of Soil Science
by Dons, A.
-- Water Quality Centre (Hamilton, N.Z.)
by -- Soil Conservation and Rivers Control Council (N.Z.);
Canterbury Agricultural College (N.Z.) -- Symposium on Hydrology and Land Management (1962 : Canterbury Agricultural College) .
by Parfitt, R.L.
-- New Zealand Soil Bureau.
by Roberts, O.T. (N.Z. Fertiliser Manufacturers Research Association. Otara);
Jarman, S.M. (DSIR New Zealand Soil Bureau. Lower Hutt).
-- DSIR New Zealand Soil BureauLower Hutt