00409nam a2200121 a 4500001000500000005001700005008004100022050002300063100002000086245006000106999001900166952010200185414020140414131957.0090218s19uu    xx            00    eng d  aTR 621.8bM55 2003  aMerrell, Jo Ann  aSimple machines :bhands-on minds-on science (primary).  c112971d112971  001040aMUbMUcTRd2009-02-18l0oTR 621.8 M55 2003pM4398r2014-04-14 00:00:00w2014-04-14yBK