003450000a22001330004500060000800000082001600008100001600024100001600040245003800056260003400094260000900128300000800137650006600145  a100  a630.243 CHO  aChopra, S L  aKanwar, J S  aAnalytical agricultural chemistry  aNew Delhi, Kalyani Publishers  c1976  a518  aagricultural chemistry / chromatography / volumetric analysis