00621nam a2200193Ia 4500 CTU_98922 210402s9999 xx 000 0 und d 384.5 L345 Laskin, Paul L. Communicating by satellite : report of the Twentieth Century Fund Task Force on International Satellite Communications Paul L. Laskin New York Twentieth Century Fund Task Force 1969 Artificial satellites in telecommunication Hiếu Trung tâm Học liệu Trường Đại học Cần Thơ