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Lau C. H., . and Chan H. Y., . Effect of sampling intensity on precision of soil and foliar data I. Paleudults derived from granite. pp. 2390-259. ISSN 0127-7065
Yew F. K., . and Chan H. Y., . Soil suitability classification systems for Hevea brasiliensis cultivation. pp. 290-302. ISSN 0127-7065