00418cam a2200145ua 4500020000900000041001000009082001800019100002500037245011200062250001200174260006000186300001200246365000900258504000500267  c7.50  aengh  a372.3bHEN/EL  aHennessy, David.E  .  aElementary teacher`s classroom science demostration and activities / cE David Hennessy.hTextual Documents  a1 / b.  aNew Delhi : bPrentice Hall of India Pvt Ltd. , c1954.  a308 ; .  a7.50  a