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MacKAY D. C, 1954, CANADIAN JOUR AGRIC SCI, V34, P451
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PINTA M, 1956, CR HEBD ACAD SCI, V243, P179
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SPINDLER F., 1956, Landwirtschaftliche Forschung, V9, P179
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RAPID QUANTITATIVE DETERMINATION OF 8 MINERAL ELEMENTS IN PLANT TISSUE BY A SYSTEMATIC PROCEDURE INVOLVING USE OF A FLAME PHOTOMETER
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WARD G. M., 1960, CANADIAN JOUR PLANT SCI, V40, P589