00332nam a2200157Ia 4500008004100000020000900041035000900050082001700059100001900076245003500095250000600130260001600136300000800152500000800160650000600168210723s9999||||xx |||||||||||||| ||und||  aNULL  a7519  a541.224BGRA  aGray, Harry B. 0aElectronics & Chemical Bonding  a-  aNew Yorkb-  a223  a634  a-