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100 0 _aSUTHERLAND, William.
245 1 0 _aEcological census techniques :
260 _aCambridge :
_bCambridge University Press,
_c1996.
300 _axv,336 p.
504 _alncludes an index.
650 0 _aEcological Survey.
908 _a070719
999 _c18550
_d18550