00315nam a2200133Ia 4500003000400000008004100004020001400045040000800059100001800067245004700085250001200132260002900144300000800173LDD181029s9999    xx            000 0 und d  a893972185  cLDD  aHarley, James 0aDesigning instructional textcJames Harley  a2nd ed.  aLondonbKogan Pagec1985  a175