RT Journal Article SR Electronic T1 Educational Obsolescence JF Science JO Science FD American Association for the Advancement of Science SP 1041 OP 1041 DO 10.1126/science.170.3962.1041 VO 170 IS 3962 A1 Glass, Bentley YR 1970 UL http://science.sciencemag.org/content/170/3962/1041.abstract AB