000 00375cam a22001097a 4500
008 180718b1971 xxu||||| |||| 00| 0 eng d
082 _aO91x73 Un3
245 _aEnvironmental science: challenge for the seventies: report
_cby National Science Board
260 _aWashington, D. C.
_bU.S. Government Printing Office
_c1971
300 _a50p.
700 _aU.S.National Science Board
999 _c494206
_d494206