00330nam a2200121Ia 450000500170000000800410001705000220005810000230008024500510010325000080015426000300016265000160019220251229184046.0251229s9999    xx            000 0 und d  aHM 101 .R57 1971   aRogers, Everett M. 0aCommunication of innovationscEverett M Rogers  a2nd  aLondonb Free Pressc1971  aInnovations