00268nam a2200097Ia 450000500170000000800410001705000160005810000180007424500380009226000400013020251229182505.0251229s9999    xx            000 0 und d  aTA 157 .E5   aDevidayal ,B. 0aEngineers Handbook.cB Devidayal   aIndiab Aggrarwal pub Pvt ltdc1987