000			00438nam a22001817a 4500
003			OSt
005			20240807130408.0
008			240807b |||||||| |||| 00| 0 eng d
020			_a9789993603702
082			_aET
110			_aREC
245			_aScience : _bClass four / _cREC
250			_a1st ed
260			_aThimphu : _bEducation Department, _c2019.
300			_axiv, 172 p. _bill. _c24 cm.
650			_aScience
942			_2ddc _cTXT
999			_c16911 _d16911