www.iuss.org/.../1974_10_kothpecc__10th_congress_ii_compressed.pdf
-me Congres International de la Science du Sol. •er Internationaler .... Natural radioactivity in podzolic soils of the Central. Povolje region. 202 ... Extraction of potassium from twenty one soils with a cation-exchange resin. M.V.Gama and M.L.B.Sousa. 233. Dissociation of exchangeable sodium of clay minerals and soils.
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