00454nam a2200145 a 450000500170000000800410001705000180005810000220007624500770009826000620017530000100023744000360024765000160028365000090029920140412111319.0000823s19uu    xx            00    eng d  aERbWh55 1972  aStaudacher, Carol  a"When is a foot not a foot?" /cby Carol Staudacher ; Art by Al Nielson.  aPalo Alto, CA :bBehavioral Research Laboratories,c1972.  a46 p.  aSullivan Topic Series - Level 2  aMeasurement  aMath