00281nam a2200121Ia 45000030006000000080041000060400015000471000021000622450038000832600009001215460012001300050017001420STCL150530s9999    xx            000 0 und d  aSTCLcSTCL  aRobinson, E.A.G.  aStructure of competitive industry  c1953  aEnglish20220125165638.0