000 00301nam a2200121Ia 4500
008 191031s9999 xx 000 0 und d
100 _aRogers (Everett M) and Shoemaker (F.Floyel)
245 0 _aCommunication of Innovations.
260 _bC. Mac
260 _c1971
365 _b171.2
942 _cBK
999 _c210933
_d210933