000 00259nam a2200121Ia 4500
100 _aPiper,H. W.
942 _cBK
654 _a
245 _aActive universe
260 _aLondon
_bUniversity of London Press
_c1962
082 _a821.709
300 _bHb
_a8243
999 _c398835
_d398835
041 _aeng