00374nam a2200133Ia 4500003000400000008004100004020002300045040000800068100002200076245007100098260004800169300001100217365001200228LDD181029s9999    xx            000 0 und d  a521457025cP 14.95  cLDD  aBruce, Bertram C. 0aNetwork-Based classroomsbpromises and realitiescBertram C. Bruce  aCambridgebCambridge University Pressc1993  ax, 302  bP 14.95