wn ee weeee When 250,000 scientific and technological articles are indexed each year--and each Is indexed to a depth of approximately 35 entries -that’s subject indexing at its finest. And it’s comingin the Fall in the PERMUTERM” SUBJECT INDEX to Science and Technology. Scientists are asking for it. And /S/ is delivering it—the ~PERMUTERM SUBJECT INDEX 1966 to Science and Technology. PS/* will quickly locate articles for you on the specific or generic subjects you are interested in through this daring new concept in subject indexing. Using the computer, like a computer was meant to be used, /S/'s exclusive Permuterm programs index the average article to a depth of approximately 35 entries. Sample formats and details are available now. Books will be delivered this Fall. Order the PERMUTERM SUBJECT INDEX. You and your research associates will be glad you did. Write dept. 29-21 0 , Sh we AES ® ph Institute bor Scientific Information 325 Chestnut Street Philadelphia, Pennsylvania 19106, U.S.A. Telephone: 215/923-3300 Cable SCINFO 8 DECEMBER 1967 1267