00326nam a2200097Ia 4500008004100000082002100041100001500062245008200077260005000159700001900209220204s9999    xx            000 0 und d  a025.5:577.4bKES  aBhat,  S G 0aAbstracting, indexing and current awareness services in environmental science  aNew DelhibIndian Documentation Servicec1978  aKesarwani, S K