TY - BOOK AU - Danapala, Wimal TI - ඉලක්කම් ඉතිහාසය SN - 9789555500821 U1 - 001 PY - 1992/// CY - Wellampitiya PB - Lassana KW - Knowledge KW - Primary Education KW - Mathematics N1 - Text in sinhala ER -