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DUGAL S L, . (1966). AGRICULTURAL ATLAS OF PUNJAB. LUDHIANA: PUNJAB AGRICUL. UNI.
DUGAL S L, . 1966. AGRICULTURAL ATLAS OF PUNJAB. LUDHIANA: PUNJAB AGRICUL. UNI.
DUGAL S L, . AGRICULTURAL ATLAS OF PUNJAB. LUDHIANA: PUNJAB AGRICUL. UNI. 1966.