00359nam a22001457a 4500020001800000082001400018100002200032245002200054260004300076300000800119490002000127650002100147650002000168700002500188  a9789559244240  a546.4 LIY  aLiyanage,Sudantha  af- Block Elements  aColombobInstitiute of Chemistryc2005  a26p  aMonograph No:30  af block elements  aMonograph No:30  aDeraniyagala,Samitha