00330nam a2200121Ia 450000500170000000800410001705000210005810000220007924500510010125000080015226000320016065000160019220251229184046.0251229s9999    xx            000 0 und d  aHM 101 .R57 1971  aRogers, Everett M 0aCommunication of innovationscEverett M Rogers  a2nd  aLondon b Free Press c1971  aInnovations