00271nam a2200109 a 4500008004100000050001700041100001600058245005700074250001200131260000900143350000900152120416s1974    xx |||||||||||||| ||    u  aHB 171.5 Hey  aHeyne, Paul10aInstructor's guide [to] The Economic way of thinking  a4th ed.  c1974  a0.00