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ThesisItem Open Access DISTRIBUTION OF DIFFERENT FORMS OF IRON AND MANGANESE IN ARID ZONE SOILS OF PUNJAB.(PUNJAB AGRICULTURAL UNIVERSITY, LUDHIANA, 1993) RAVINDER SINGH; CHAHAL, D. S.12052017_0003_0002_Abstract.pdfThesisItem Open Access BIOLOGY OF THE POPLER LEADWEBBER ASPHADASTIS CRYPHOMYCHA MEYRICK (REPIDOPTERA : PYRALIDAE) ON POPLAR(PUNJAB AGRICULTURAL UNIVERSITY; LUDHIANA, 1993) RAVINDER SINGH; SOHI, A. S.