00421nam a2200145Ia 450000100060000000800410000602000180004704000130006508200190007810000210009724500850011826000540020330000110025754600070026819454140407s9999    xx            000 0 und d  a0-521-45270-8  cPK-LaUMT  a 609.73bROS-E  aNathan Rosenberg  aExploring rthe black box:bTechnology, economics, and history.cNathan Rosenberg  aCambridge,USA:bCambridge University Press,c1994  a274 p.  aEN