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040 _cchekey
082 _aA9.1
245 _aBhutan journal of research and development :
_bvolume 9 number 1 spring 2020
260 _aThimphu :
_bRUB,
_c2020.
300 _a106 p. :
_bill, ;
_c24 cm.
650 _abjrd
942 _2ddc
_cJR
999 _c6793
_d6793