000 00281nam a2200097Ia 4500
008 211215s9999 xx 000 0 und d
040 _cJayakar Knowledge Resource Centre
245 0 _aEncyclopedia of science & technology: Vol 15
260 _bMc Graw hill
_aN. york
_c1960
942 _c1
999 _c73201
_d73201