00314nam a2200121Ia 4500003000400000020001400004082001600018245007100034260004500105300001000150546001200160650002000172OSt  a070797986  a503bMCG/MC  aMc Graw hill encyclopedia of science and technology V.12bSAB-SPIN  aNewYorkbMc Graw Hill Book companyc1971  a715p.  aEnglish  aGeneral science