000 00317nam a2200133 4500
003 OSt
008 220602b |||||||| |||| 00| 0 eng d
082 _a509
_bDIS
245 _aDiscovery
260 _bMethuen and co;
_c1961
300 _a144p.;
_c20cm
650 0 _aNatural sciences and mathematics
942 _2ddc
_cLM
999 _c104455
_d104455