000 002850000a22001210004500
245 _aNatural symbold : explorations in cosmology
100 _aDouglas, Mary
260 _aLondon
_bBoris & Jenkins
_c1973
300 _a219 p.
080 _a301.085.2
_bD6
041 _aEN
942 _cBK
999 _c96885
_d96885