00442nam a2200145Ia 450000500170000000800530001724500310007026000460010130000590014730000340020602000080024065000160024805000200026454600120028420260803094143.0251212s9999    xx            000 0 und d [?] [?] [?]1 aUnderstanding electricity.  aQuezon City :bFelta Multi Media,cc [?].  a: b1 videodisc (DVD) (55 mins) : sd., col.; 4 3/4 in.  dPhysical science; grades 6-12  aDVD  aElectricity  a621.3 Un21 c[?]  aEnglish