00000nam a2200000 a 4500 20251203091145.0 541.224 CAR Cartmell, E. Valency and molecular structure New Delhi English Language Book society 1977 341 p. 22 cm. PB Chemistry Molecular structure ENGLISH _ 31259 C 32015 32015 2 0 0 0 PU PU 1999-03-18 2.45 0 541.224 CAR 31259 BK