000 00289 a2200109 4500
008 180927b xxu||||| |||| 00| 0
100 _aHaslett, A. W.
245 _aUnsolved problems of science /
_cA. W. Haslett
260 _aLondon
_bG. Bell & Sons Ltd.
_c1936
300 _a140p.
942 _2ddc
_cBK
999 _c7126
_d7126