000 00296 a2200121 4500
245 1 _aReadings from Scintific American
_bCommunication
260 _aSan Francisco
_bW.H. Freman & Co.
_c1972
650 _aCommunication
100 _a
_d
300 _a136 p.
080 _a007
_bR 287
901 _a128095
999 _c57860
_d57860