000 00323nam a2200181 4500
020 _a
_c
082 _a330 BIO
100 _a
245 _aBio-gas plants at the village level
250 _a
260 _a
_c
300 _a
490 _a
500 _a
590 _a
_b
_c
650 _aEconomics
942 _cBK
999 _c312999
_d312999