00470nam a2200169Ia 4500008004100000010001300041020001800054040001700072082002300089100002000112245006500132260004400197300001000241650002400251942000800275999001700283190328s9999||||xx |||||||||||||| ||und||  a69-12349  a0-85229-155-8  aNITILcNITIL  221sta505.8bB862B  aBenton, William 0aBritanica yearbook of science and the futurecWilliam Benton  aChicagobEncyclopaedia Britannicac1971  a448p.  aScience-Periodicals  cBKS  c35150d35150